| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 017/124] drm/vmwgfx: NULL pointer dereference in vmw_surface_define_ioctl() | Date | Thu, 20 Apr 2017 08:34:52 +0200 |
| |
3.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Murray McAllister <murray.mcallister@insomniasec.com>
commit 36274ab8c596f1240c606bb514da329add2a1bcd 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: Murray McAllister <murray.mcallister@insomniasec.com> Reviewed-by: Sinclair Yeh <syeh@vmware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c @@ -711,8 +711,8 @@ 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 +
|