From: Arun Kumar Neelakantam <aneela@xxxxxxxxxxxxxx>
commit ac74ea01860170699fb3b6ea80c0476774c8e94f upstream.
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@xxxxxxxxxxxxxxx
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Signed-off-by: Arun Kumar Neelakantam <aneela@xxxxxxxxxxxxxx>
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/rpmsg/qcom_glink_native.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -1104,13 +1104,12 @@ static int qcom_glink_create_remote(stru
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;
}
