diff options
| author | D. Wythe <alibuda@linux.alibaba.com> | 2023-11-03 09:07:38 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-11-06 13:01:07 +0300 |
| commit | 5211c9729484c923f8d2e06bd29f9322cc42bb8f (patch) | |
| tree | 4b7ec90ea3cbc136dcb5253670e487b5cdac7cc9 /net/smc/af_smc.c | |
| parent | d93f9528573e1d419b69ca5ff4130201d05f6b90 (diff) | |
| download | linux-5211c9729484c923f8d2e06bd29f9322cc42bb8f.tar.xz | |
net/smc: fix dangling sock under state SMC_APPFINCLOSEWAIT
Considering scenario:
smc_cdc_rx_handler
__smc_release
sock_set_flag
smc_close_active()
sock_set_flag
__set_bit(DEAD) __set_bit(DONE)
Dues to __set_bit is not atomic, the DEAD or DONE might be lost.
if the DEAD flag lost, the state SMC_CLOSED will be never be reached
in smc_close_passive_work:
if (sock_flag(sk, SOCK_DEAD) &&
smc_close_sent_any_close(conn)) {
sk->sk_state = SMC_CLOSED;
} else {
/* just shutdown, but not yet closed locally */
sk->sk_state = SMC_APPFINCLOSEWAIT;
}
Replace sock_set_flags or __set_bit to set_bit will fix this problem.
Since set_bit is atomic.
Fixes: b38d732477e4 ("smc: socket closing and linkgroup cleanup")
Signed-off-by: D. Wythe <alibuda@linux.alibaba.com>
Reviewed-by: Dust Li <dust.li@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/smc/af_smc.c')
| -rw-r--r-- | net/smc/af_smc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index abd2667734d4..da97f946b79b 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -275,7 +275,7 @@ static int __smc_release(struct smc_sock *smc) if (!smc->use_fallback) { rc = smc_close_active(smc); - sock_set_flag(sk, SOCK_DEAD); + smc_sock_set_flag(sk, SOCK_DEAD); sk->sk_shutdown |= SHUTDOWN_MASK; } else { if (sk->sk_state != SMC_CLOSED) { @@ -1743,7 +1743,7 @@ static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) if (new_clcsock) sock_release(new_clcsock); new_sk->sk_state = SMC_CLOSED; - sock_set_flag(new_sk, SOCK_DEAD); + smc_sock_set_flag(new_sk, SOCK_DEAD); sock_put(new_sk); /* final */ *new_smc = NULL; goto out; |