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CVE-2017-7261 vmwgfx: check that number of mip levels is above zero (rhbz 1435719 1435740)

This commit is contained in:
Justin M. Forbes 2017-03-27 16:23:42 -05:00
parent 1fd0030165
commit 3a0275274a
2 changed files with 39 additions and 0 deletions
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6
kernel.spec
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@ -605,6 +605,9 @@ Patch665: netfilter-x_tables-deal-with-bogus-nextoffset-values.patch
# Fix virtio devices rhbz 1430297
Patch669: virtio_pci-fix-out-of-bound-access-for-msix_names.patch
#CVE-2017-7261 rhbz 1435719 1435740
Patch670: vmwgfx-check-that-number-of-mip-levels-is-above-zero.patch
# END OF PATCH DEFINITIONS
%endif
@ -2169,6 +2172,9 @@ fi
#
#
%changelog
* Mon Mar 27 2017 Justin M. Forbes <jforbes@fedoraproject.org>
- CVE-2017-7261 vmwgfx: check that number of mip levels is above zero (rhbz 1435719 1435740)
* Mon Mar 27 2017 Laura Abbott <labbott@fedoraproject.org> - 4.11.0-0.rc4.git0.1
- Linux v4.11-rc4

33
vmwgfx-check-that-number-of-mip-levels-is-above-zero.patch Normal file
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@ -0,0 +1,33 @@
From: Vladis Dronov <vdronov@redhat.com>
Subject: [PATCH] drm/vmwgfx: Check check that number of mip levels is above zero in vmw_surface_define_ioctl()
Date: 2017-03-24 15:37:10
In vmw_surface_define_ioctl(), a num_sizes parameter is assigned a
user-controlled value which is not checked for zero. It is used in
a call to kmalloc() which returns ZERO_SIZE_PTR. Later ZERO_SIZE_PTR
is dereferenced which leads to a GPF and possibly to a kernel panic.
Add the check for zero to avoid this.
Reference: https://bugzilla.redhat.com/show_bug.cgi?id=1435719
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
---
drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index b445ce9..42840cc 100644
--- 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_device *dev, void *data,
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 <= 0 ||
+ num_sizes > DRM_VMW_MAX_SURFACE_FACES * DRM_VMW_MAX_MIP_LEVELS)
return -EINVAL;
size = vmw_user_surface_size + 128 +
--
2.9.3