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tls: rx: release the sock lock on locking timeout

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Eric reports we should release the socket lock if the entire
"grab reader lock" operation has failed. The callers assume
they don't have to release it or otherwise unwind.

Reported-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot+16e72110feb2b653ef27@syzkaller.appspotmail.com
Fixes: 4cbc325ed6 ("tls: rx: allow only one reader at a time")
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20220720203701.2179034-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2022-07-20 13:37:00 -07:00
parent b945804d99
commit dde06aaa89
1 changed files with 13 additions and 4 deletions
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17
net/tls/tls_sw.c
View file

@ -1803,6 +1803,7 @@ static long tls_rx_reader_lock(struct sock *sk, struct tls_sw_context_rx *ctx,
bool nonblock)
{
long timeo;
int err;
lock_sock(sk);
@ -1818,15 +1819,23 @@ static long tls_rx_reader_lock(struct sock *sk, struct tls_sw_context_rx *ctx,
!READ_ONCE(ctx->reader_present), &wait);
remove_wait_queue(&ctx->wq, &wait);
if (!timeo)
return -EAGAIN;
if (signal_pending(current))
return sock_intr_errno(timeo);
if (timeo <= 0) {
err = -EAGAIN;
goto err_unlock;
}
if (signal_pending(current)) {
err = sock_intr_errno(timeo);
goto err_unlock;
}
}
WRITE_ONCE(ctx->reader_present, 1);
return timeo;
err_unlock:
release_sock(sk);
return err;
}
static void tls_rx_reader_unlock(struct sock *sk, struct tls_sw_context_rx *ctx)