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Message-Id: <20220623073605.27386-1-hbh25y@gmail.com>
Date: Thu, 23 Jun 2022 15:36:05 +0800
From: Hangyu Hua <hbh25y@...il.com>
To: bjorn.andersson@...aro.org, mathieu.poirier@...aro.org,
krzysztof.kozlowski@...aro.org, gregkh@...uxfoundation.org
Cc: linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH] rpmsg: fix possible refcount leak in rpmsg_register_device_override()
[1] commit 1680939e9ecf ("rpmsg: virtio: Fix possible double free in
rpmsg_virtio_add_ctrl_dev()")
[2] commit c2eecefec5df ("rpmsg: virtio: Fix possible double free in
rpmsg_probe()")
[3] commit bb17d110cbf2 ("rpmsg: Fix calling device_lock() on
non-initialized device")
The above three patches merged at the same time introduced a new bug.
[1] and [2] make rpmsg_ns_register_device and rpmsg_ctrldev_register_device
need to call the callback function internally to free vch when it fails.
[3] has an error return path not handled vch.
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>
---
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
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