if vmw_execbuf_fence_commands() fails, The handle value will be uninitialized and a bogus fence handle might be copied to user-space.
Cc: stable@vger.kernel.org Fixes: 2724b2d54cda: ("drm/vmwgfx: Use new validation interface for the modesetting code v2") Reported-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Thomas Hellstrom thellstrom@vmware.com Reviewed-by: Brian Paul brianp@vmware.com Reviewed-by: Sinclair Yeh syeh@vmware.com --- drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c index b351fb5214d3..3330bc89f1b9 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c @@ -2554,7 +2554,7 @@ void vmw_kms_helper_validation_finish(struct vmw_private *dev_priv, user_fence_rep) { struct vmw_fence_obj *fence = NULL; - uint32_t handle; + uint32_t handle = 0; int ret;
if (file_priv || user_fence_rep || vmw_validation_has_bos(ctx) || @@ -2562,7 +2562,7 @@ void vmw_kms_helper_validation_finish(struct vmw_private *dev_priv, ret = vmw_execbuf_fence_commands(file_priv, dev_priv, &fence, file_priv ? &handle : NULL); vmw_validation_done(ctx, fence); - if (file_priv) + if (file_priv && !ret) vmw_execbuf_copy_fence_user(dev_priv, vmw_fpriv(file_priv), ret, user_fence_rep, fence, handle, -1, NULL);