From ac74ea01860170699fb3b6ea80c0476774c8e94f Mon Sep 17 00:00:00 2001 From: Arun Kumar Neelakantam Date: Fri, 4 Oct 2019 15:26:58 -0700 Subject: [PATCH] rpmsg: glink: Fix use after free in open_ack TIMEOUT case 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 Signed-off-by: Arun Kumar Neelakantam Signed-off-by: Bjorn Andersson --- 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; }