drm/vmwgfx: NULL pointer dereference from vmw_cmd_dx_view_define()

commit bcd6aa7b6cbfd6f985f606c6f76046d782905820 upstream.

If SVGA_3D_CMD_DX_DEFINE_RENDERTARGET_VIEW is called with a surface
ID of SVGA3D_INVALID_ID, the srf struct will remain NULL after
vmw_cmd_res_check(), leading to a null pointer dereference in
vmw_view_add().

Cc: <stable@vger.kernel.org>
Fixes: d80efd5cb3de ("drm/vmwgfx: Initial DX support")
Signed-off-by: Murray McAllister <murray.mcallister@gmail.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index c89bc783fe48acf9834abb6d08bf1991a09442c4..3834aa71c9c4c90c72f835d9e3db185f73d27e5f 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -2733,6 +2733,10 @@ static int vmw_cmd_dx_view_define(struct vmw_private *dev_priv,
        if (view_type == vmw_view_max)
                return -EINVAL;
        cmd = container_of(header, typeof(*cmd), header);
+       if (unlikely(cmd->sid == SVGA3D_INVALID_ID)) {
+               DRM_ERROR("Invalid surface id.\n");
+               return -EINVAL;
+       }
        ret = vmw_cmd_res_check(dev_priv, sw_context, vmw_res_surface,
                                user_surface_converter,
                                &cmd->sid, &srf_node);