4.19-stable patches

added patches:
	fbdev-imsttfb-fix-use-after-free-bug-in-imsttfb_probe.patch
	video-imsttfb-check-for-ioremap-failures.patch

diff --git a/queue-4.19/fbdev-imsttfb-fix-use-after-free-bug-in-imsttfb_probe.patch b/queue-4.19/fbdev-imsttfb-fix-use-after-free-bug-in-imsttfb_probe.patch
new file mode 100644 (file)
index 0000000..1b14579
--- /dev/null
+++ b/queue-4.19/fbdev-imsttfb-fix-use-after-free-bug-in-imsttfb_probe.patch
@@ -0,0 +1,75 @@
+From c75f5a55061091030a13fef71b9995b89bc86213 Mon Sep 17 00:00:00 2001
+From: Zheng Wang <zyytlz.wz@163.com>
+Date: Thu, 27 Apr 2023 11:08:41 +0800
+Subject: fbdev: imsttfb: Fix use after free bug in imsttfb_probe
+
+From: Zheng Wang <zyytlz.wz@163.com>
+
+commit c75f5a55061091030a13fef71b9995b89bc86213 upstream.
+
+A use-after-free bug may occur if init_imstt invokes framebuffer_release
+and free the info ptr. The caller, imsttfb_probe didn't notice that and
+still keep the ptr as private data in pdev.
+
+If we remove the driver which will call imsttfb_remove to make cleanup,
+UAF happens.
+
+Fix it by return error code if bad case happens in init_imstt.
+
+Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
+Signed-off-by: Helge Deller <deller@gmx.de>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/video/fbdev/imsttfb.c |   15 ++++++++-------
+ 1 file changed, 8 insertions(+), 7 deletions(-)
+
+--- a/drivers/video/fbdev/imsttfb.c
++++ b/drivers/video/fbdev/imsttfb.c
+@@ -1348,7 +1348,7 @@ static struct fb_ops imsttfb_ops = {
+       .fb_ioctl       = imsttfb_ioctl,
+ };
+ 
+-static void init_imstt(struct fb_info *info)
++static int init_imstt(struct fb_info *info)
+ {
+       struct imstt_par *par = info->par;
+       __u32 i, tmp, *ip, *end;
+@@ -1420,7 +1420,7 @@ static void init_imstt(struct fb_info *i
+           || !(compute_imstt_regvals(par, info->var.xres, info->var.yres))) {
+               printk("imsttfb: %ux%ux%u not supported\n", info->var.xres, info->var.yres, info->var.bits_per_pixel);
+               framebuffer_release(info);
+-              return;
++              return -ENODEV;
+       }
+ 
+       sprintf(info->fix.id, "IMS TT (%s)", par->ramdac == IBM ? "IBM" : "TVP");
+@@ -1456,12 +1456,13 @@ static void init_imstt(struct fb_info *i
+ 
+       if (register_framebuffer(info) < 0) {
+               framebuffer_release(info);
+-              return;
++              return -ENODEV;
+       }
+ 
+       tmp = (read_reg_le32(par->dc_regs, SSTATUS) & 0x0f00) >> 8;
+       fb_info(info, "%s frame buffer; %uMB vram; chip version %u\n",
+               info->fix.id, info->fix.smem_len >> 20, tmp);
++      return 0;
+ }
+ 
+ static int imsttfb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+@@ -1527,10 +1528,10 @@ static int imsttfb_probe(struct pci_dev
+       if (!par->cmap_regs)
+               goto error;
+       info->pseudo_palette = par->palette;
+-      init_imstt(info);
+-
+-      pci_set_drvdata(pdev, info);
+-      return 0;
++      ret = init_imstt(info);
++      if (!ret)
++              pci_set_drvdata(pdev, info);
++      return ret;
+ 
+ error:
+       if (par->dc_regs)

diff --git a/queue-4.19/series b/queue-4.19/series
index 967f63b28ea2f11eaec5a3a6ef024543740a62c5..c6462b0d75122cd37ad1b3750f329bab401c3aab 100644 (file)
--- a/queue-4.19/series
+++ b/queue-4.19/series
@@ -1,3 +1,5 @@
 gfs2-don-t-deref-jdesc-in-evict.patch
 x86-microcode-amd-load-late-on-both-threads-too.patch
 x86-smp-use-dedicated-cache-line-for-mwait_play_dead.patch
+video-imsttfb-check-for-ioremap-failures.patch
+fbdev-imsttfb-fix-use-after-free-bug-in-imsttfb_probe.patch

diff --git a/queue-4.19/video-imsttfb-check-for-ioremap-failures.patch b/queue-4.19/video-imsttfb-check-for-ioremap-failures.patch
new file mode 100644 (file)
index 0000000..89a1c7c
--- /dev/null
+++ b/queue-4.19/video-imsttfb-check-for-ioremap-failures.patch
@@ -0,0 +1,78 @@
+From 13b7c0390a5d3840e1e2cda8f44a310fdbb982de Mon Sep 17 00:00:00 2001
+From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Date: Mon, 3 May 2021 13:57:34 +0200
+Subject: video: imsttfb: check for ioremap() failures
+
+From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+commit 13b7c0390a5d3840e1e2cda8f44a310fdbb982de upstream.
+
+We should check if ioremap() were to somehow fail in imsttfb_probe() and
+handle the unwinding of the resources allocated here properly.
+
+Ideally if anyone cares about this driver (it's for a PowerMac era PCI
+display card), they wouldn't even be using fbdev anymore.  Or the devm_*
+apis could be used, but that's just extra work for diminishing
+returns...
+
+Cc: Finn Thain <fthain@telegraphics.com.au>
+Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
+Reviewed-by: Rob Herring <robh@kernel.org>
+Link: https://lore.kernel.org/r/20210503115736.2104747-68-gregkh@linuxfoundation.org
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/video/fbdev/imsttfb.c |   21 ++++++++++++++++++---
+ 1 file changed, 18 insertions(+), 3 deletions(-)
+
+--- a/drivers/video/fbdev/imsttfb.c
++++ b/drivers/video/fbdev/imsttfb.c
+@@ -1470,6 +1470,7 @@ static int imsttfb_probe(struct pci_dev
+       struct imstt_par *par;
+       struct fb_info *info;
+       struct device_node *dp;
++      int ret = -ENOMEM;
+       
+       dp = pci_device_to_OF_node(pdev);
+       if(dp)
+@@ -1508,23 +1509,37 @@ static int imsttfb_probe(struct pci_dev
+               default:
+                       printk(KERN_INFO "imsttfb: Device 0x%x unknown, "
+                                        "contact maintainer.\n", pdev->device);
+-                      release_mem_region(addr, size);
+-                      framebuffer_release(info);
+-                      return -ENODEV;
++                      ret = -ENODEV;
++                      goto error;
+       }
+ 
+       info->fix.smem_start = addr;
+       info->screen_base = (__u8 *)ioremap(addr, par->ramdac == IBM ?
+                                           0x400000 : 0x800000);
++      if (!info->screen_base)
++              goto error;
+       info->fix.mmio_start = addr + 0x800000;
+       par->dc_regs = ioremap(addr + 0x800000, 0x1000);
++      if (!par->dc_regs)
++              goto error;
+       par->cmap_regs_phys = addr + 0x840000;
+       par->cmap_regs = (__u8 *)ioremap(addr + 0x840000, 0x1000);
++      if (!par->cmap_regs)
++              goto error;
+       info->pseudo_palette = par->palette;
+       init_imstt(info);
+ 
+       pci_set_drvdata(pdev, info);
+       return 0;
++
++error:
++      if (par->dc_regs)
++              iounmap(par->dc_regs);
++      if (info->screen_base)
++              iounmap(info->screen_base);
++      release_mem_region(addr, size);
++      framebuffer_release(info);
++      return ret;
+ }
+ 
+ static void imsttfb_remove(struct pci_dev *pdev)