linux-kernel - [PATCH] drm: Fix potential null pointer dereference issues in drm

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Message-Id: <20250524091515.3594232-1-haoxiang_li2024@163.com>
Date: Sat, 24 May 2025 17:15:15 +0800
From: Haoxiang Li <haoxiang_li2024@....com>
To: maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	sam@...nborg.org
Cc: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Haoxiang Li <haoxiang_li2024@....com>,
	stable@...r.kernel.org
Subject: [PATCH] drm: Fix potential null pointer dereference issues in drm_managed.c

Add check for the return value of kstrdup_const() in drm_managed.c
to prevent potential null pointer dereference.

Fixes: c6603c740e0e ("drm: add managed resources tied to drm_device")
Cc: stable@...r.kernel.org
Signed-off-by: Haoxiang Li <haoxiang_li2024@....com>
---
 drivers/gpu/drm/drm_managed.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/drm_managed.c b/drivers/gpu/drm/drm_managed.c
index cc4c463daae7..0ff8335a337b 100644
--- a/drivers/gpu/drm/drm_managed.c
+++ b/drivers/gpu/drm/drm_managed.c
@@ -151,6 +151,11 @@ int __drmm_add_action(struct drm_device *dev,
 	}
 
 	dr->node.name = kstrdup_const(name, GFP_KERNEL);
+	if (!dr->node.name) {
+		kfree(dr);
+		return -ENOMEM;
+	}
+
 	if (data) {
 		void_ptr = (void **)&dr->data;
 		*void_ptr = data;
@@ -236,6 +241,10 @@ void *drmm_kmalloc(struct drm_device *dev, size_t size, gfp_t gfp)
 		return NULL;
 	}
 	dr->node.name = kstrdup_const("kmalloc", gfp);
+	if (!dr->node.name) {
+		kfree(dr);
+		return NULL;
+	}
 
 	add_dr(dev, dr);
 
-- 
2.25.1