linux-kernel - [PATCH v2] rpmsg: fix possible refcount leak in rpmsg_register_device

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Message-Id: <20220624024120.11576-1-hbh25y@gmail.com>
Date:   Fri, 24 Jun 2022 10:41:20 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     bjorn.andersson@...aro.org, mathieu.poirier@...aro.org,
        gregkh@...uxfoundation.org, krzysztof.kozlowski@...aro.org
Cc:     linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH v2] rpmsg: fix possible refcount leak in rpmsg_register_device_override()

rpmsg_register_device_override need to call put_device to free vch when
driver_set_override fails.

Fix this by adding a put_device() to the error path.

Fixes: bb17d110cbf2 ("rpmsg: Fix calling device_lock() on non-initialized device")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---

v2: change the commit log.

 drivers/rpmsg/rpmsg_core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
index 290c1f02da10..5a47cad89fdc 100644
--- a/drivers/rpmsg/rpmsg_core.c
+++ b/drivers/rpmsg/rpmsg_core.c
@@ -618,6 +618,7 @@ int rpmsg_register_device_override(struct rpmsg_device *rpdev,
 					  strlen(driver_override));
 		if (ret) {
 			dev_err(dev, "device_set_override failed: %d\n", ret);
+			put_device(dev);
 			return ret;
 		}
 	}
-- 
2.25.1