linux-kernel - [PATCH] media: v4l2-mem2mem: fix a memleak in v4l2_m2m_register

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Message-Id: <20240201124846.3054579-1-alexious@zju.edu.cn>
Date: Thu,  1 Feb 2024 20:48:44 +0800
From: Zhipeng Lu <alexious@....edu.cn>
To: alexious@....edu.cn
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Hans Verkuil <hverkuil-cisco@...all.nl>,
	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
	linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] media: v4l2-mem2mem: fix a memleak in v4l2_m2m_register_entity

The entity->name (i.e. name) is allocated in v4l2_m2m_register_entity
but isn't freed in its following error-handling paths. This patch
adds such deallocation to prevent memleak of entity->name.

Fixes: be2fff656322 ("media: add helpers for memory-to-memory media controller")
Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
---
 drivers/media/v4l2-core/v4l2-mem2mem.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 0cc30397fbad..8db9ac9c1433 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -1084,11 +1084,17 @@ static int v4l2_m2m_register_entity(struct media_device *mdev,
 	entity->function = function;
 
 	ret = media_entity_pads_init(entity, num_pads, pads);
-	if (ret)
+	if (ret) {
+		kfree(entity->name);
+		entity->name = NULL;
 		return ret;
+	}
 	ret = media_device_register_entity(mdev, entity);
-	if (ret)
+	if (ret) {
+		kfree(entity->name);
+		entity->name = NULL;
 		return ret;
+	}
 
 	return 0;
 }
-- 
2.34.1