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net: mctp: move expiry timer delete to unhash 

Currently, we delete the key expiry timer (in sk->close) before
unhashing the sk. This means that another thread may find the sk through
its presence on the key list, and re-queue the timer.

This change moves the timer deletion to the unhash, after we have made
the key no longer observable, so the timer cannot be re-queued.

Fixes: 7b14e15ae6 ("mctp: Implement a timeout for tags")
Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jeremy Kerr 2023-01-24 10:01:04 +08:00 committed by David S. Miller
parent de8a6b15d9
commit 5f41ae6fca
1 changed files with 6 additions and 3 deletions
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9
net/mctp/af_mctp.c
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@ -544,9 +544,6 @@ static int mctp_sk_init(struct sock *sk)
static void mctp_sk_close(struct sock *sk, long timeout)
{
struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk);
del_timer_sync(&msk->key_expiry);
sk_common_release(sk);
}
@ -581,6 +578,12 @@ static void mctp_sk_unhash(struct sock *sk)
__mctp_key_remove(key, net, fl2, MCTP_TRACE_KEY_CLOSED);
}
spin_unlock_irqrestore(&net->mctp.keys_lock, flags);
/* Since there are no more tag allocations (we have removed all of the
* keys), stop any pending expiry events. the timer cannot be re-queued
* as the sk is no longer observable
*/
del_timer_sync(&msk->key_expiry);
}
static struct proto mctp_proto = {