There have been reports [1][2] that vmw_cmd_dx_define_query() can be called with ctx_node->ctx set to NULL, which results in undefined behavior in vmw_context_cotable(). Avoid this be returning an errno code. Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> Link: https://www.cve.org/CVERecord?id=CVE-2022-38096 # 1 Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=2073 # 2 Cc: stable@xxxxxxxxxxxxxxx --- drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c index 6b9aa2b4ef54..1e90362add96 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c @@ -1256,7 +1256,7 @@ static int vmw_cmd_dx_define_query(struct vmw_private *dev_priv, struct vmw_resource *cotable_res; int ret; - if (!ctx_node) + if (!ctx_node || !ctx_node->ctx) return -EINVAL; cmd = container_of(header, typeof(*cmd), header); -- 2.39.2
