4.7-stable review patch. If anyone has any objections, please let me know.
------------------ From: Sudeep Holla <[email protected]> commit 9ef3c5112139cc5c5666ee096e05bc1e00e94015 upstream. tdev->signal is not set NULL after it's freed. This will cause random exceptions when the stale pointer is accessed after tdev->signal is freed. Also, since tdev->signal allocation is skipped the next time it's written, this leads to continuous fault finally leading to the total death of the system. Fixes: d1c2f87c9a8f ("mailbox: mailbox-test: Prevent memory leak") Signed-off-by: Sudeep Holla <[email protected]> Acked-by: Lee Jones <[email protected]> Signed-off-by: Jassi Brar <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/mailbox/mailbox-test.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/mailbox/mailbox-test.c +++ b/drivers/mailbox/mailbox-test.c @@ -133,6 +133,7 @@ static ssize_t mbox_test_message_write(s out: kfree(tdev->signal); kfree(tdev->message); + tdev->signal = NULL; return ret < 0 ? ret : count; }
