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[x86] vmwgfx: NULL pointer dereference in vmw_surface_define_ioctl() (CVE-2017-7261)

This commit is contained in:
Ben Hutchings 2017-03-29 22:36:05 +01:00
parent 2dd2d226ca
commit de3e9af4dc
3 changed files with 32 additions and 0 deletions
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2
debian/changelog vendored
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@ -139,6 +139,8 @@ linux (4.9.18-1) UNRELEASED; urgency=medium
(CVE-2017-7184)
* xfrm_user: validate XFRM_MSG_NEWAE incoming ESN size harder (CVE-2017-7184)
* scsi: sg: check length passed to SG_NEXT_CMD_LEN (CVE-2017-7187)
* [x86] vmwgfx: NULL pointer dereference in vmw_surface_define_ioctl()
(CVE-2017-7261)
-- Ben Hutchings <ben@decadent.org.uk> Mon, 27 Mar 2017 21:54:36 +0100

29
debian/patches/bugfix/x86/vmwgfx-null-pointer-dereference-in-vmw_surface_define_ioctl.patch vendored Normal file
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@ -0,0 +1,29 @@
From: Murray McAllister <murray.mcallister@insomniasec.com>
Date: Fri, 24 Mar 2017 20:33:00 -0700
Subject: vmwgfx: NULL pointer dereference in vmw_surface_define_ioctl()
Origin: https://cgit.freedesktop.org/mesa/vmwgfx/commit/?id=e904061d2c8968429954be87ad1cc45526510812
Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2017-7261
Before memory allocations vmw_surface_define_ioctl() checks the
upper-bounds of a user-supplied size, but does not check if the
supplied size is 0.
Add check to avoid NULL pointer dereferences.
Signed-off-by: Murray McAllister <murray.mcallister@insomniasec.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
[bwh: Fix filename]
---
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -716,8 +716,8 @@ int vmw_surface_define_ioctl(struct drm_
for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i)
num_sizes += req->mip_levels[i];
- if (num_sizes > DRM_VMW_MAX_SURFACE_FACES *
- DRM_VMW_MAX_MIP_LEVELS)
+ if (num_sizes > DRM_VMW_MAX_SURFACE_FACES * DRM_VMW_MAX_MIP_LEVELS ||
+ num_sizes == 0)
return -EINVAL;
size = vmw_user_surface_size + 128 +

1
debian/patches/series vendored
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@ -122,6 +122,7 @@ bugfix/all/sctp-deny-peeloff-operation-on-asocs-with-threads-sl.patch
bugfix/all/xfrm_user-validate-xfrm_msg_newae-xfrma_replay_esn_val-replay_window.patch
bugfix/all/xfrm_user-validate-xfrm_msg_newae-incoming-esn-size-harder.patch
bugfix/all/scsi-sg-check-length-passed-to-sg_next_cmd_len.patch
bugfix/x86/vmwgfx-null-pointer-dereference-in-vmw_surface_define_ioctl.patch
# Fix exported symbol versions
bugfix/ia64/revert-ia64-move-exports-to-definitions.patch