]> git.ipfire.org Git - thirdparty/kernel/stable-queue.git/commitdiff
4.4-stable patches
authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 7 Dec 2017 12:24:05 +0000 (13:24 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 7 Dec 2017 12:24:05 +0000 (13:24 +0100)
added patches:
usb-core-add-type-specific-length-check-of-bos-descriptors.patch
usb-devio-prevent-integer-overflow-in-proc_do_submiturb.patch
usb-host-fix-incorrect-updating-of-offset.patch
usb-hub-cycle-hub-power-when-initialization-fails.patch
usb-increase-usbfs-transfer-limit.patch
usb-usbfs-filter-flags-passed-in-from-user-space.patch
usb-xhci-fix-panic-in-xhci_free_virt_devices_depth_first.patch

queue-4.4/series
queue-4.4/usb-core-add-type-specific-length-check-of-bos-descriptors.patch [new file with mode: 0644]
queue-4.4/usb-devio-prevent-integer-overflow-in-proc_do_submiturb.patch [new file with mode: 0644]
queue-4.4/usb-host-fix-incorrect-updating-of-offset.patch [new file with mode: 0644]
queue-4.4/usb-hub-cycle-hub-power-when-initialization-fails.patch [new file with mode: 0644]
queue-4.4/usb-increase-usbfs-transfer-limit.patch [new file with mode: 0644]
queue-4.4/usb-usbfs-filter-flags-passed-in-from-user-space.patch [new file with mode: 0644]
queue-4.4/usb-xhci-fix-panic-in-xhci_free_virt_devices_depth_first.patch [new file with mode: 0644]

index e66370ac6d05caee832e3ca256ad347a28c9b70b..0d26b9ca3bc8e22b73a975465784b8b58fb1cd11 100644 (file)
@@ -38,3 +38,10 @@ mm-avoid-returning-vm_fault_retry-from-page_mkwrite-handlers.patch
 xen-netfront-improve-error-handling-during-initialization.patch
 net-fec-fix-multicast-filtering-hardware-setup.patch
 revert-ocfs2-should-wait-dio-before-inode-lock-in-ocfs2_setattr.patch
+usb-hub-cycle-hub-power-when-initialization-fails.patch
+usb-xhci-fix-panic-in-xhci_free_virt_devices_depth_first.patch
+usb-core-add-type-specific-length-check-of-bos-descriptors.patch
+usb-increase-usbfs-transfer-limit.patch
+usb-devio-prevent-integer-overflow-in-proc_do_submiturb.patch
+usb-usbfs-filter-flags-passed-in-from-user-space.patch
+usb-host-fix-incorrect-updating-of-offset.patch
diff --git a/queue-4.4/usb-core-add-type-specific-length-check-of-bos-descriptors.patch b/queue-4.4/usb-core-add-type-specific-length-check-of-bos-descriptors.patch
new file mode 100644 (file)
index 0000000..7e1791d
--- /dev/null
@@ -0,0 +1,109 @@
+From 81cf4a45360f70528f1f64ba018d61cb5767249a Mon Sep 17 00:00:00 2001
+From: Masakazu Mokuno <masakazu.mokuno@gmail.com>
+Date: Fri, 10 Nov 2017 01:25:50 +0900
+Subject: USB: core: Add type-specific length check of BOS descriptors
+
+From: Masakazu Mokuno <masakazu.mokuno@gmail.com>
+
+commit 81cf4a45360f70528f1f64ba018d61cb5767249a upstream.
+
+As most of BOS descriptors are longer in length than their header
+'struct usb_dev_cap_header', comparing solely with it is not sufficient
+to avoid out-of-bounds access to BOS descriptors.
+
+This patch adds descriptor type specific length check in
+usb_get_bos_descriptor() to fix the issue.
+
+Signed-off-by: Masakazu Mokuno <masakazu.mokuno@gmail.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ drivers/usb/core/config.c    |   28 ++++++++++++++++++++++++----
+ include/uapi/linux/usb/ch9.h |    3 +++
+ 2 files changed, 27 insertions(+), 4 deletions(-)
+
+--- a/drivers/usb/core/config.c
++++ b/drivers/usb/core/config.c
+@@ -871,14 +871,25 @@ void usb_release_bos_descriptor(struct u
+       }
+ }
++static const __u8 bos_desc_len[256] = {
++      [USB_CAP_TYPE_WIRELESS_USB] = USB_DT_USB_WIRELESS_CAP_SIZE,
++      [USB_CAP_TYPE_EXT]          = USB_DT_USB_EXT_CAP_SIZE,
++      [USB_SS_CAP_TYPE]           = USB_DT_USB_SS_CAP_SIZE,
++      [USB_SSP_CAP_TYPE]          = USB_DT_USB_SSP_CAP_SIZE(1),
++      [CONTAINER_ID_TYPE]         = USB_DT_USB_SS_CONTN_ID_SIZE,
++      [USB_PTM_CAP_TYPE]          = USB_DT_USB_PTM_ID_SIZE,
++};
++
+ /* Get BOS descriptor set */
+ int usb_get_bos_descriptor(struct usb_device *dev)
+ {
+       struct device *ddev = &dev->dev;
+       struct usb_bos_descriptor *bos;
+       struct usb_dev_cap_header *cap;
++      struct usb_ssp_cap_descriptor *ssp_cap;
+       unsigned char *buffer;
+-      int length, total_len, num, i;
++      int length, total_len, num, i, ssac;
++      __u8 cap_type;
+       int ret;
+       bos = kzalloc(sizeof(struct usb_bos_descriptor), GFP_KERNEL);
+@@ -931,7 +942,13 @@ int usb_get_bos_descriptor(struct usb_de
+                       dev->bos->desc->bNumDeviceCaps = i;
+                       break;
+               }
++              cap_type = cap->bDevCapabilityType;
+               length = cap->bLength;
++              if (bos_desc_len[cap_type] && length < bos_desc_len[cap_type]) {
++                      dev->bos->desc->bNumDeviceCaps = i;
++                      break;
++              }
++
+               total_len -= length;
+               if (cap->bDescriptorType != USB_DT_DEVICE_CAPABILITY) {
+@@ -939,7 +956,7 @@ int usb_get_bos_descriptor(struct usb_de
+                       continue;
+               }
+-              switch (cap->bDevCapabilityType) {
++              switch (cap_type) {
+               case USB_CAP_TYPE_WIRELESS_USB:
+                       /* Wireless USB cap descriptor is handled by wusb */
+                       break;
+@@ -952,8 +969,11 @@ int usb_get_bos_descriptor(struct usb_de
+                               (struct usb_ss_cap_descriptor *)buffer;
+                       break;
+               case USB_SSP_CAP_TYPE:
+-                      dev->bos->ssp_cap =
+-                              (struct usb_ssp_cap_descriptor *)buffer;
++                      ssp_cap = (struct usb_ssp_cap_descriptor *)buffer;
++                      ssac = (le32_to_cpu(ssp_cap->bmAttributes) &
++                              USB_SSP_SUBLINK_SPEED_ATTRIBS) + 1;
++                      if (length >= USB_DT_USB_SSP_CAP_SIZE(ssac))
++                              dev->bos->ssp_cap = ssp_cap;
+                       break;
+               case CONTAINER_ID_TYPE:
+                       dev->bos->ss_id =
+--- a/include/uapi/linux/usb/ch9.h
++++ b/include/uapi/linux/usb/ch9.h
+@@ -812,6 +812,8 @@ struct usb_wireless_cap_descriptor {       /*
+       __u8  bReserved;
+ } __attribute__((packed));
++#define USB_DT_USB_WIRELESS_CAP_SIZE  11
++
+ /* USB 2.0 Extension descriptor */
+ #define       USB_CAP_TYPE_EXT                2
+@@ -991,6 +993,7 @@ enum usb3_link_state {
+       USB3_LPM_U3
+ };
++#define USB_DT_USB_PTM_ID_SIZE                3
+ /*
+  * A U1 timeout of 0x0 means the parent hub will reject any transitions to U1.
+  * 0xff means the parent hub will accept transitions to U1, but will not
diff --git a/queue-4.4/usb-devio-prevent-integer-overflow-in-proc_do_submiturb.patch b/queue-4.4/usb-devio-prevent-integer-overflow-in-proc_do_submiturb.patch
new file mode 100644 (file)
index 0000000..2b07b5e
--- /dev/null
@@ -0,0 +1,52 @@
+From 57999d1107c1e60c2ca7088f2ac0f819e2f554b3 Mon Sep 17 00:00:00 2001
+From: Dan Carpenter <dan.carpenter@oracle.com>
+Date: Fri, 22 Sep 2017 23:43:25 +0300
+Subject: USB: devio: Prevent integer overflow in proc_do_submiturb()
+
+From: Dan Carpenter <dan.carpenter@oracle.com>
+
+commit 57999d1107c1e60c2ca7088f2ac0f819e2f554b3 upstream.
+
+There used to be an integer overflow check in proc_do_submiturb() but
+we removed it.  It turns out that it's still required.  The
+uurb->buffer_length variable is a signed integer and it's controlled by
+the user.  It can lead to an integer overflow when we do:
+
+       num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
+
+If we strip away the macro then that line looks like this:
+
+       num_sgs = (uurb->buffer_length + USB_SG_SIZE - 1) / USB_SG_SIZE;
+                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+It's the first addition which can overflow.
+
+Fixes: 1129d270cbfb ("USB: Increase usbfs transfer limit")
+Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
+Acked-by: Alan Stern <stern@rowland.harvard.edu>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ drivers/usb/core/devio.c |    5 +++++
+ 1 file changed, 5 insertions(+)
+
+--- a/drivers/usb/core/devio.c
++++ b/drivers/usb/core/devio.c
+@@ -118,6 +118,9 @@ module_param(usbfs_memory_mb, uint, 0644
+ MODULE_PARM_DESC(usbfs_memory_mb,
+               "maximum MB allowed for usbfs buffers (0 = no limit)");
++/* Hard limit, necessary to avoid arithmetic overflow */
++#define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
++
+ static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
+ /* Check whether it's okay to allocate more memory for a transfer */
+@@ -1298,6 +1301,8 @@ static int proc_do_submiturb(struct usb_
+                               USBDEVFS_URB_ZERO_PACKET |
+                               USBDEVFS_URB_NO_INTERRUPT))
+               return -EINVAL;
++      if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
++              return -EINVAL;
+       if (uurb->buffer_length > 0 && !uurb->buffer)
+               return -EINVAL;
+       if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
diff --git a/queue-4.4/usb-host-fix-incorrect-updating-of-offset.patch b/queue-4.4/usb-host-fix-incorrect-updating-of-offset.patch
new file mode 100644 (file)
index 0000000..2a266c2
--- /dev/null
@@ -0,0 +1,37 @@
+From 1d5a31582ef046d3b233f0da1a68ae26519b2f0a Mon Sep 17 00:00:00 2001
+From: Colin Ian King <colin.king@canonical.com>
+Date: Tue, 7 Nov 2017 16:45:04 +0000
+Subject: usb: host: fix incorrect updating of offset
+
+From: Colin Ian King <colin.king@canonical.com>
+
+commit 1d5a31582ef046d3b233f0da1a68ae26519b2f0a upstream.
+
+The variable temp is incorrectly being updated, instead it should
+be offset otherwise the loop just reads the same capability value
+and loops forever.  Thanks to Alan Stern for pointing out the
+correct fix to my original fix.  Fix also cleans up clang warning:
+
+drivers/usb/host/ehci-dbg.c:840:4: warning: Value stored to 'temp'
+is never read
+
+Fixes: d49d43174400 ("USB: misc ehci updates")
+Signed-off-by: Colin Ian King <colin.king@canonical.com>
+Acked-by: Alan Stern <stern@rowland.harvard.edu>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ drivers/usb/host/ehci-dbg.c |    2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/usb/host/ehci-dbg.c
++++ b/drivers/usb/host/ehci-dbg.c
+@@ -851,7 +851,7 @@ static ssize_t fill_registers_buffer(str
+                       default:                /* unknown */
+                               break;
+                       }
+-                      temp = (cap >> 8) & 0xff;
++                      offset = (cap >> 8) & 0xff;
+               }
+       }
+ #endif
diff --git a/queue-4.4/usb-hub-cycle-hub-power-when-initialization-fails.patch b/queue-4.4/usb-hub-cycle-hub-power-when-initialization-fails.patch
new file mode 100644 (file)
index 0000000..4b638a9
--- /dev/null
@@ -0,0 +1,57 @@
+From 973593a960ddac0f14f0d8877d2d0abe0afda795 Mon Sep 17 00:00:00 2001
+From: Mike Looijmans <mike.looijmans@topic.nl>
+Date: Thu, 9 Nov 2017 13:16:46 +0100
+Subject: usb: hub: Cycle HUB power when initialization fails
+
+From: Mike Looijmans <mike.looijmans@topic.nl>
+
+commit 973593a960ddac0f14f0d8877d2d0abe0afda795 upstream.
+
+Sometimes the USB device gets confused about the state of the initialization and
+the connection fails. In particular, the device thinks that it's already set up
+and running while the host thinks the device still needs to be configured. To
+work around this issue, power-cycle the hub's output to issue a sort of "reset"
+to the device. This makes the device restart its state machine and then the
+initialization succeeds.
+
+This fixes problems where the kernel reports a list of errors like this:
+
+usb 1-1.3: device not accepting address 19, error -71
+
+The end result is a non-functioning device. After this patch, the sequence
+becomes like this:
+
+usb 1-1.3: new high-speed USB device number 18 using ci_hdrc
+usb 1-1.3: device not accepting address 18, error -71
+usb 1-1.3: new high-speed USB device number 19 using ci_hdrc
+usb 1-1.3: device not accepting address 19, error -71
+usb 1-1-port3: attempt power cycle
+usb 1-1.3: new high-speed USB device number 21 using ci_hdrc
+usb-storage 1-1.3:1.2: USB Mass Storage device detected
+
+Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
+Acked-by: Alan Stern <stern@rowland.harvard.edu>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ drivers/usb/core/hub.c |    9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+--- a/drivers/usb/core/hub.c
++++ b/drivers/usb/core/hub.c
+@@ -4858,6 +4858,15 @@ loop:
+               usb_put_dev(udev);
+               if ((status == -ENOTCONN) || (status == -ENOTSUPP))
+                       break;
++
++              /* When halfway through our retry count, power-cycle the port */
++              if (i == (SET_CONFIG_TRIES / 2) - 1) {
++                      dev_info(&port_dev->dev, "attempt power cycle\n");
++                      usb_hub_set_port_power(hdev, hub, port1, false);
++                      msleep(2 * hub_power_on_good_delay(hub));
++                      usb_hub_set_port_power(hdev, hub, port1, true);
++                      msleep(hub_power_on_good_delay(hub));
++              }
+       }
+       if (hub->hdev->parent ||
+                       !hcd->driver->port_handed_over ||
diff --git a/queue-4.4/usb-increase-usbfs-transfer-limit.patch b/queue-4.4/usb-increase-usbfs-transfer-limit.patch
new file mode 100644 (file)
index 0000000..9d102d2
--- /dev/null
@@ -0,0 +1,100 @@
+From 1129d270cbfbb7e2b1ec3dede4a13930bdd10e41 Mon Sep 17 00:00:00 2001
+From: Mateusz Berezecki <mateuszb@fastmail.fm>
+Date: Wed, 21 Dec 2016 09:19:14 -0800
+Subject: USB: Increase usbfs transfer limit
+
+From: Mateusz Berezecki <mateuszb@fastmail.fm>
+
+commit 1129d270cbfbb7e2b1ec3dede4a13930bdd10e41 upstream.
+
+Promote a variable keeping track of USB transfer memory usage to a
+wider data type and allow for higher bandwidth transfers from a large
+number of USB devices connected to a single host.
+
+Signed-off-by: Mateusz Berezecki <mateuszb@fastmail.fm>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ drivers/usb/core/devio.c |   43 ++++++++++++++++---------------------------
+ 1 file changed, 16 insertions(+), 27 deletions(-)
+
+--- a/drivers/usb/core/devio.c
++++ b/drivers/usb/core/devio.c
+@@ -113,42 +113,35 @@ enum snoop_when {
+ #define USB_DEVICE_DEV                MKDEV(USB_DEVICE_MAJOR, 0)
+ /* Limit on the total amount of memory we can allocate for transfers */
+-static unsigned usbfs_memory_mb = 16;
++static u32 usbfs_memory_mb = 16;
+ module_param(usbfs_memory_mb, uint, 0644);
+ MODULE_PARM_DESC(usbfs_memory_mb,
+               "maximum MB allowed for usbfs buffers (0 = no limit)");
+-/* Hard limit, necessary to avoid arithmetic overflow */
+-#define USBFS_XFER_MAX                (UINT_MAX / 2 - 1000000)
+-
+-static atomic_t usbfs_memory_usage;   /* Total memory currently allocated */
++static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
+ /* Check whether it's okay to allocate more memory for a transfer */
+-static int usbfs_increase_memory_usage(unsigned amount)
++static int usbfs_increase_memory_usage(u64 amount)
+ {
+-      unsigned lim;
++      u64 lim;
+-      /*
+-       * Convert usbfs_memory_mb to bytes, avoiding overflows.
+-       * 0 means use the hard limit (effectively unlimited).
+-       */
+       lim = ACCESS_ONCE(usbfs_memory_mb);
+-      if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
+-              lim = USBFS_XFER_MAX;
+-      else
+-              lim <<= 20;
++      lim <<= 20;
+-      atomic_add(amount, &usbfs_memory_usage);
+-      if (atomic_read(&usbfs_memory_usage) <= lim)
+-              return 0;
+-      atomic_sub(amount, &usbfs_memory_usage);
+-      return -ENOMEM;
++      atomic64_add(amount, &usbfs_memory_usage);
++
++      if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
++              atomic64_sub(amount, &usbfs_memory_usage);
++              return -ENOMEM;
++      }
++
++      return 0;
+ }
+ /* Memory for a transfer is being deallocated */
+-static void usbfs_decrease_memory_usage(unsigned amount)
++static void usbfs_decrease_memory_usage(u64 amount)
+ {
+-      atomic_sub(amount, &usbfs_memory_usage);
++      atomic64_sub(amount, &usbfs_memory_usage);
+ }
+ static int connected(struct usb_dev_state *ps)
+@@ -1077,7 +1070,7 @@ static int proc_bulk(struct usb_dev_stat
+       if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
+               return -EINVAL;
+       len1 = bulk.len;
+-      if (len1 >= USBFS_XFER_MAX)
++      if (len1 >= (INT_MAX - sizeof(struct urb)))
+               return -EINVAL;
+       ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
+       if (ret)
+@@ -1424,10 +1417,6 @@ static int proc_do_submiturb(struct usb_
+               return -EINVAL;
+       }
+-      if (uurb->buffer_length >= USBFS_XFER_MAX) {
+-              ret = -EINVAL;
+-              goto error;
+-      }
+       if (uurb->buffer_length > 0 &&
+                       !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
+                               uurb->buffer, uurb->buffer_length)) {
diff --git a/queue-4.4/usb-usbfs-filter-flags-passed-in-from-user-space.patch b/queue-4.4/usb-usbfs-filter-flags-passed-in-from-user-space.patch
new file mode 100644 (file)
index 0000000..f04fd83
--- /dev/null
@@ -0,0 +1,47 @@
+From 446f666da9f019ce2ffd03800995487e79a91462 Mon Sep 17 00:00:00 2001
+From: Oliver Neukum <oneukum@suse.com>
+Date: Thu, 23 Nov 2017 16:39:52 +0100
+Subject: USB: usbfs: Filter flags passed in from user space
+
+From: Oliver Neukum <oneukum@suse.com>
+
+commit 446f666da9f019ce2ffd03800995487e79a91462 upstream.
+
+USBDEVFS_URB_ISO_ASAP must be accepted only for ISO endpoints.
+Improve sanity checking.
+
+Reported-by: Andrey Konovalov <andreyknvl@google.com>
+Signed-off-by: Oliver Neukum <oneukum@suse.com>
+Acked-by: Alan Stern <stern@rowland.harvard.edu>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ drivers/usb/core/devio.c |   14 +++++++++-----
+ 1 file changed, 9 insertions(+), 5 deletions(-)
+
+--- a/drivers/usb/core/devio.c
++++ b/drivers/usb/core/devio.c
+@@ -1293,14 +1293,18 @@ static int proc_do_submiturb(struct usb_
+       int number_of_packets = 0;
+       unsigned int stream_id = 0;
+       void *buf;
+-
+-      if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
+-                              USBDEVFS_URB_SHORT_NOT_OK |
++      unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
+                               USBDEVFS_URB_BULK_CONTINUATION |
+                               USBDEVFS_URB_NO_FSBR |
+                               USBDEVFS_URB_ZERO_PACKET |
+-                              USBDEVFS_URB_NO_INTERRUPT))
+-              return -EINVAL;
++                              USBDEVFS_URB_NO_INTERRUPT;
++      /* USBDEVFS_URB_ISO_ASAP is a special case */
++      if (uurb->type == USBDEVFS_URB_TYPE_ISO)
++              mask |= USBDEVFS_URB_ISO_ASAP;
++
++      if (uurb->flags & ~mask)
++                      return -EINVAL;
++
+       if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
+               return -EINVAL;
+       if (uurb->buffer_length > 0 && !uurb->buffer)
diff --git a/queue-4.4/usb-xhci-fix-panic-in-xhci_free_virt_devices_depth_first.patch b/queue-4.4/usb-xhci-fix-panic-in-xhci_free_virt_devices_depth_first.patch
new file mode 100644 (file)
index 0000000..955ee81
--- /dev/null
@@ -0,0 +1,72 @@
+From 80e457699a8dbdd70f2d26911e46f538645c55fc Mon Sep 17 00:00:00 2001
+From: Yu Chen <chenyu56@huawei.com>
+Date: Fri, 1 Dec 2017 13:41:20 +0200
+Subject: usb: xhci: fix panic in xhci_free_virt_devices_depth_first
+
+From: Yu Chen <chenyu56@huawei.com>
+
+commit 80e457699a8dbdd70f2d26911e46f538645c55fc upstream.
+
+Check vdev->real_port 0 to avoid panic
+[    9.261347] [<ffffff800884a390>] xhci_free_virt_devices_depth_first+0x58/0x108
+[    9.261352] [<ffffff800884a814>] xhci_mem_cleanup+0x1bc/0x570
+[    9.261355] [<ffffff8008842de8>] xhci_stop+0x140/0x1c8
+[    9.261365] [<ffffff80087ed304>] usb_remove_hcd+0xfc/0x1d0
+[    9.261369] [<ffffff80088551c4>] xhci_plat_remove+0x6c/0xa8
+[    9.261377] [<ffffff80086e928c>] platform_drv_remove+0x2c/0x70
+[    9.261384] [<ffffff80086e6ea0>] __device_release_driver+0x80/0x108
+[    9.261387] [<ffffff80086e7a1c>] device_release_driver+0x2c/0x40
+[    9.261392] [<ffffff80086e5f28>] bus_remove_device+0xe0/0x120
+[    9.261396] [<ffffff80086e2e34>] device_del+0x114/0x210
+[    9.261399] [<ffffff80086e9e00>] platform_device_del+0x30/0xa0
+[    9.261403] [<ffffff8008810bdc>] dwc3_otg_work+0x204/0x488
+[    9.261407] [<ffffff80088133fc>] event_work+0x304/0x5b8
+[    9.261414] [<ffffff80080e31b0>] process_one_work+0x148/0x490
+[    9.261417] [<ffffff80080e3548>] worker_thread+0x50/0x4a0
+[    9.261421] [<ffffff80080e9ea0>] kthread+0xe8/0x100
+[    9.261427] [<ffffff8008083680>] ret_from_fork+0x10/0x50
+
+The problem can occur if xhci_plat_remove() is called shortly after
+xhci_plat_probe(). While xhci_free_virt_devices_depth_first been
+called before the device has been setup and get real_port initialized.
+The problem occurred on Hikey960 and was reproduced by Guenter Roeck
+on Kevin with chromeos-4.4.
+
+Fixes: ee8665e28e8d ("xhci: free xhci virtual devices with leaf nodes first")
+Cc: Guenter Roeck <groeck@google.com>
+Reviewed-by: Guenter Roeck <groeck@chromium.org>
+Tested-by: Guenter Roeck <linux@roeck-us.net>
+Signed-off-by: Fan Ning <fanning4@hisilicon.com>
+Signed-off-by: Li Rui <lirui39@hisilicon.com>
+Signed-off-by: yangdi <yangdi10@hisilicon.com>
+Signed-off-by: Yu Chen <chenyu56@huawei.com>
+Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ drivers/usb/host/xhci-mem.c |    7 +++++++
+ 1 file changed, 7 insertions(+)
+
+--- a/drivers/usb/host/xhci-mem.c
++++ b/drivers/usb/host/xhci-mem.c
+@@ -981,6 +981,12 @@ void xhci_free_virt_devices_depth_first(
+       if (!vdev)
+               return;
++      if (vdev->real_port == 0 ||
++                      vdev->real_port > HCS_MAX_PORTS(xhci->hcs_params1)) {
++              xhci_dbg(xhci, "Bad vdev->real_port.\n");
++              goto out;
++      }
++
+       tt_list_head = &(xhci->rh_bw[vdev->real_port - 1].tts);
+       list_for_each_entry_safe(tt_info, next, tt_list_head, tt_list) {
+               /* is this a hub device that added a tt_info to the tts list */
+@@ -994,6 +1000,7 @@ void xhci_free_virt_devices_depth_first(
+                       }
+               }
+       }
++out:
+       /* we are now at a leaf device */
+       xhci_free_virt_device(xhci, slot_id);
+ }