This is a note to let you know that I've just added the patch titled net/smc: fix 'workqueue leaked lock' in smc_conn_abort_work to the 5.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-smc-fix-workqueue-leaked-lock-in-smc_conn_abort_.patch and it can be found in the queue-5.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 9c16827976a9392bcbcdd81270f92cb1465a0863 Author: Karsten Graul <kgraul@xxxxxxxxxxxxx> Date: Mon Sep 20 21:18:15 2021 +0200 net/smc: fix 'workqueue leaked lock' in smc_conn_abort_work [ Upstream commit a18cee4791b1123d0a6579a7c89f4b87e48abe03 ] The abort_work is scheduled when a connection was detected to be out-of-sync after a link failure. The work calls smc_conn_kill(), which calls smc_close_active_abort() and that might end up calling smc_close_cancel_work(). smc_close_cancel_work() cancels any pending close_work and tx_work but needs to release the sock_lock before and acquires the sock_lock again afterwards. So when the sock_lock was NOT acquired before then it may be held after the abort_work completes. Thats why the sock_lock is acquired before the call to smc_conn_kill() in __smc_lgr_terminate(), but this is missing in smc_conn_abort_work(). Fix that by acquiring the sock_lock first and release it after the call to smc_conn_kill(). Fixes: b286a0651e44 ("net/smc: handle incoming CDC validation message") Signed-off-by: Karsten Graul <kgraul@xxxxxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index c160ff50c053..116cfd6fac1f 100644 --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -1474,7 +1474,9 @@ static void smc_conn_abort_work(struct work_struct *work) abort_work); struct smc_sock *smc = container_of(conn, struct smc_sock, conn); + lock_sock(&smc->sk); smc_conn_kill(conn, true); + release_sock(&smc->sk); sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */ }