From: Arun Kumar Neelakantam aneela@codeaurora.org

Extra channel reference put when remote sending OPEN_ACK after timeout causes use-after-free while handling next remote CLOSE command.

Remove extra reference put in timeout case to avoid use-after-free.

Fixes: b4f8e52b89f6 ("rpmsg: Introduce Qualcomm RPM glink driver") Cc: stable@vger.kernel.org Tested-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org Signed-off-by: Arun Kumar Neelakantam aneela@codeaurora.org Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org ---

Changes since v1: - None

drivers/rpmsg/qcom_glink_native.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index 9355ce26fd98..72ed671f5dcd 100644 --- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -1103,13 +1103,12 @@ static int qcom_glink_create_remote(struct qcom_glink *glink, close_link: /* * Send a close request to "undo" our open-ack. The close-ack will - * release the last reference. + * release qcom_glink_send_open_req() reference and the last reference + * will be relesed after receiving remote_close or transport unregister + * by calling qcom_glink_native_remove(). */ qcom_glink_send_close_req(glink, channel);

- /* Release qcom_glink_send_open_req() reference */ - kref_put(&channel->refcount, qcom_glink_channel_release); - return ret; }