6.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Haoxiang Li <redacted>

commit bf72b4b7bb7dbb643d204fa41e7463894a95999f upstream.

In vmw_compat_shader_add(), the return value check of vmw_shader_alloc()
is not proper. Modify the check for the return pointer 'res'.

Found by code review and compiled on ubuntu 20.04.

Fixes: 18e4a4669c50 ("drm/vmwgfx: Fix compat shader namespace")
Cc: stable@vger.kernel.org
Signed-off-by: Haoxiang Li <redacted>
Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Link: https://patch.msgid.link/20251224091105.1569464-1-lihaoxiang@isrc.iscas.ac.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_shader.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c

@@ -923,8 +923,10 @@ int vmw_compat_shader_add(struct vmw_pri
 	ttm_bo_unreserve(&buf->tbo);
 
 	res = vmw_shader_alloc(dev_priv, buf, size, 0, shader_type);
-	if (unlikely(ret != 0))
+	if (IS_ERR(res)) {
+		ret = PTR_ERR(res);
 		goto no_reserve;
+	}
 
 	ret = vmw_cmdbuf_res_add(man, vmw_cmdbuf_res_shader,
 				 vmw_shader_key(user_key, shader_type),