rpmsg: virtio: Fix possible double free in rpmsg_probe()

[ Upstream commit c2eecefec5df1306eafce28ccdf1ca159a552ecc ]

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@gmail.com>
Tested-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Link: https://lore.kernel.org/r/20220426060536.15594-2-hbh25y@gmail.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index 8e49a3b..834a081 100644 (file)
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -964,7 +964,8 @@ 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;
        }
 
        /*
@@ -988,8 +989,6 @@ 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: