Commit b2662945 authored by Murray McAllister's avatar Murray McAllister Committed by Greg Kroah-Hartman

drm/vmwgfx: NULL pointer dereference in vmw_surface_define_ioctl()

commit 36274ab8 upstream.

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: default avatarMurray McAllister <murray.mcallister@insomniasec.com>
Reviewed-by: default avatarSinclair Yeh <syeh@vmware.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ed528923
......@@ -718,8 +718,8 @@ 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 +
......
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