drm: vmwgfx: fix information leak to userland
Structure drm_vmw_fence_rep is copied to userland with field "pad64"
uninitialized. It leads to leaking of contents of kernel stack memory.
Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index 51d9f9f..76954e3 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -691,6 +691,7 @@
fence_rep.error = ret;
fence_rep.fence_seq = (uint64_t) sequence;
+ fence_rep.pad64 = 0;
user_fence_rep = (struct drm_vmw_fence_rep __user *)
(unsigned long)arg->fence_rep;