diff options
| author | D. Wythe <alibuda@linux.alibaba.com> | 2023-11-03 14:07:38 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-11-20 10:29:21 +0100 |
| commit | 09f104cb0f0ac534459049aa01f82241f61c5012 (patch) | |
| tree | d6242163501e050604a0d206690bff13ae5d1221 | |
| parent | d1d004585b40c212b338fc8a40cbaaf230ea4703 (diff) | |
| download | linux-stable-09f104cb0f0ac534459049aa01f82241f61c5012.tar.gz linux-stable-09f104cb0f0ac534459049aa01f82241f61c5012.tar.bz2 linux-stable-09f104cb0f0ac534459049aa01f82241f61c5012.zip | |
net/smc: fix dangling sock under state SMC_APPFINCLOSEWAIT
[ Upstream commit 5211c9729484c923f8d2e06bd29f9322cc42bb8f ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | net/smc/af_smc.c | 4 | ||||
| -rw-r--r-- | net/smc/smc.h | 5 | ||||
| -rw-r--r-- | net/smc/smc_cdc.c | 2 | ||||
| -rw-r--r-- | net/smc/smc_close.c | 2 |
4 files changed, 9 insertions, 4 deletions
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 6b30bec54b62..ad0ac657fe12 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -141,7 +141,7 @@ static int smc_release(struct socket *sock) 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_LISTEN && sk->sk_state != SMC_INIT) @@ -852,7 +852,7 @@ 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; diff --git a/net/smc/smc.h b/net/smc/smc.h index adbdf195eb08..c3b0e1e3f505 100644 --- a/net/smc/smc.h +++ b/net/smc/smc.h @@ -268,4 +268,9 @@ static inline bool using_ipsec(struct smc_sock *smc) struct sock *smc_accept_dequeue(struct sock *parent, struct socket *new_sock); void smc_close_non_accepted(struct sock *sk); +static inline void smc_sock_set_flag(struct sock *sk, enum sock_flags flag) +{ + set_bit(flag, &sk->sk_flags); +} + #endif /* __SMC_H */ diff --git a/net/smc/smc_cdc.c b/net/smc/smc_cdc.c index 333e4353498f..c657fd29ff5d 100644 --- a/net/smc/smc_cdc.c +++ b/net/smc/smc_cdc.c @@ -304,7 +304,7 @@ static void smc_cdc_msg_recv_action(struct smc_sock *smc, smc->sk.sk_shutdown |= RCV_SHUTDOWN; if (smc->clcsock && smc->clcsock->sk) smc->clcsock->sk->sk_shutdown |= RCV_SHUTDOWN; - sock_set_flag(&smc->sk, SOCK_DONE); + smc_sock_set_flag(&smc->sk, SOCK_DONE); sock_hold(&smc->sk); /* sock_put in close_work */ if (!schedule_work(&conn->close_work)) sock_put(&smc->sk); diff --git a/net/smc/smc_close.c b/net/smc/smc_close.c index cac0773f5ebd..4ea28ec7ad13 100644 --- a/net/smc/smc_close.c +++ b/net/smc/smc_close.c @@ -164,7 +164,7 @@ static void smc_close_active_abort(struct smc_sock *smc) break; } - sock_set_flag(sk, SOCK_DEAD); + smc_sock_set_flag(sk, SOCK_DEAD); sk->sk_state_change(sk); } |