From: Maurizio Lombardi mlombard@redhat.com
[ Upstream commit 0755d3be2d9bb6ea38598ccd30d6bbaa1a5c3a50 ]
The sk_user_data pointer is supposed to be modified only while holding the write_lock "sk_callback_lock", otherwise we could race with other threads and crash the kernel.
we can't take the write_lock in nvmet_tcp_state_change() because it would cause a deadlock, but the release_work queue will set the pointer to NULL later so we can simply remove the assignment.
Fixes: b5332a9f3f3d ("nvmet-tcp: fix incorrect locking in state_change sk callback")
Signed-off-by: Maurizio Lombardi mlombard@redhat.com Reviewed-by: Sagi Grimberg sagi@grimberg.me Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/target/tcp.c | 1 - 1 file changed, 1 deletion(-)
diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c index d8aceef83284..07ee347ea3f3 100644 --- a/drivers/nvme/target/tcp.c +++ b/drivers/nvme/target/tcp.c @@ -1497,7 +1497,6 @@ static void nvmet_tcp_state_change(struct sock *sk) case TCP_CLOSE_WAIT: case TCP_CLOSE: /* FALLTHRU */ - sk->sk_user_data = NULL; nvmet_tcp_schedule_release_queue(queue); break; default: