USB: usbfs: Don't WARN about excessively large memory allocations

commit 4f2629ea67e7225c3fd292c7fe4f5b3c9d6392de upstream.

Syzbot found that the kernel generates a WARNing if the user tries to
submit a bulk transfer through usbfs with a buffer that is way too
large.  This isn't a bug in the kernel; it's merely an invalid request
from the user and the usbfs code does handle it correctly.

In theory the same thing can happen with async transfers, or with the
packet descriptor table for isochronous transfers.

To prevent the MM subsystem from complaining about these bad
allocation requests, add the __GFP_NOWARN flag to the kmalloc calls
for these buffers.

CC: Andrew Morton <akpm@linux-foundation.org>
CC: <stable@vger.kernel.org>
Reported-and-tested-by: syzbot+882a85c0c8ec4a3e2281@syzkaller.appspotmail.com
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20210518201835.GA1140918@rowland.harvard.edu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 732e7f1687dd25bda7bed4b4facb24bfa0e7950a..a45443482e0b48900cdadefeef629d8069578e5e 100644 (file)
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1189,7 +1189,12 @@ static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
        ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
        if (ret)
                return ret;
-       tbuf = kmalloc(len1, GFP_KERNEL);
+
+       /*
+        * len1 can be almost arbitrarily large.  Don't WARN if it's
+        * too big, just fail the request.
+        */
+       tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
        if (!tbuf) {
                ret = -ENOMEM;
                goto done;
@@ -1631,7 +1636,7 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb
        if (num_sgs) {
                as->urb->sg = kmalloc_array(num_sgs,
                                            sizeof(struct scatterlist),
-                                           GFP_KERNEL);
+                                           GFP_KERNEL | __GFP_NOWARN);
                if (!as->urb->sg) {
                        ret = -ENOMEM;
                        goto error;
@@ -1666,7 +1671,7 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb
                                        (uurb_start - as->usbm->vm_start);
                } else {
                        as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
-                                       GFP_KERNEL);
+                                       GFP_KERNEL | __GFP_NOWARN);
                        if (!as->urb->transfer_buffer) {
                                ret = -ENOMEM;
                                goto error;