linux-kernel - [PATCH] drm/vmwgfx: Fix an error return check in vmw_compat_shader

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Message-Id: <20251224091105.1569464-1-lihaoxiang@isrc.iscas.ac.cn>
Date: Wed, 24 Dec 2025 17:11:05 +0800
From: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
To: zack.rusin@...adcom.com,
	bcm-kernel-feedback-list@...adcom.com,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	jakob@...are.com,
	thellstrom@...are.com
Cc: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH] drm/vmwgfx: Fix an error return check in vmw_compat_shader_add()

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@...r.kernel.org
Signed-off-by: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_shader.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c b/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
index 69dfe69ce0f8..7ed938710342 100644
--- 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_private *dev_priv,
 	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),
-- 
2.25.1