linux-kernel - [PATCH v2 1/3] rpmsg: virtio: fix possible double free in rpmsg

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Date:   Tue, 26 Apr 2022 14:05:34 +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 1/3] rpmsg: virtio: fix possible double free in rpmsg_probe()

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

Fix this by changing error path from free_vch to free_ctrldev.

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 | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index 3ede25b1f2e4..0130d0ba548c 100644
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -973,7 +973,8 @@ static int rpmsg_probe(struct virtio_device *vdev)
 
 		err = rpmsg_ns_register_device(rpdev_ns);
 		if (err)
-			goto free_vch;
+			/* vch will be free in virtio_rpmsg_release_device() */
+			goto free_ctrldev;
 	}
 
 	/*
@@ -997,8 +998,6 @@ static int rpmsg_probe(struct virtio_device *vdev)
 
 	return 0;
 
-free_vch:
-	kfree(vch);
 free_ctrldev:
 	rpmsg_virtio_del_ctrl_dev(rpdev_ctrl);
 free_coherent:
-- 
2.25.1