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nvme-tcp: can't set sk_user_data without write_lock 

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: b5332a9f3f ("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>
This commit is contained in:
Maurizio Lombardi 2021-07-02 10:11:21 +02:00 committed by Christoph Hellwig
parent 585af8ede7
commit 0755d3be2d
1 changed files with 0 additions and 1 deletions
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1
drivers/nvme/target/tcp.c
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@ -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: