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drm/vmwgfx: NULL pointer dereference in vmw_surface_define_ioctl()

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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.

Cc: <stable@vger.kernel.org>
Signed-off-by: Murray McAllister <murray.mcallister@insomniasec.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
This commit is contained in:
Murray McAllister 2017-03-27 11:12:53 +02:00 committed by Thomas Hellstrom
parent f7652afa8e
commit 36274ab8c5
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
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@ -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 > DRM_VMW_MAX_SURFACE_FACES * DRM_VMW_MAX_MIP_LEVELS ||
num_sizes == 0)
return -EINVAL;
size = vmw_user_surface_size + 128 +