linux-kernel - [PATCH v2 2/3] rpmsg: virtio: fix possible double free in rpmsg_virtio_add_ctrl

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Message-Id: <20220426060536.15594-3-hbh25y@gmail.com>
Date:   Tue, 26 Apr 2022 14:05:35 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     bjorn.andersson@...aro.org, mathieu.poirier@...aro.org,
        arnaud.pouliquen@...s.st.com
Cc:     linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH v2 2/3] rpmsg: virtio: fix possible double free in rpmsg_virtio_add_ctrl_dev()

vch will be free in virtio_rpmsg_release_device() when
rpmsg_ctrldev_register_device() fails. There is no need to call
kfree() again.

Fixes: c486682ae1e2 ("rpmsg: virtio: Register the rpmsg_char device")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
Tested-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
---
 drivers/rpmsg/virtio_rpmsg_bus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index 0130d0ba548c..291fc1cfab7f 100644
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -851,7 +851,7 @@ static struct rpmsg_device *rpmsg_virtio_add_ctrl_dev(struct virtio_device *vdev
 
 	err = rpmsg_ctrldev_register_device(rpdev_ctrl);
 	if (err) {
-		kfree(vch);
+		/* vch will be free in virtio_rpmsg_release_device() */
 		return ERR_PTR(err);
 	}
 
-- 
2.25.1