summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorUrsula Braun <ubraun@linux.ibm.com>2019-11-15 12:39:30 +0100
committerDavid S. Miller <davem@davemloft.net>2019-11-16 13:03:33 -0800
commit8204df72bea1a7d83d0777add6da98a41dfbdc34 (patch)
treed03e35ca966bb3310276b80a10caebb70d497ecc
parenta36e629ee77a9df78310c972655092e41ce07ea4 (diff)
downloadlinux-sh-8204df72bea1a7d83d0777add6da98a41dfbdc34.tar.gz
net/smc: fix fastopen for non-blocking connect()
FASTOPEN does not work with SMC-sockets. Since SMC allows fallback to TCP native during connection start, the FASTOPEN setsockopts trigger this fallback, if the SMC-socket is still in state SMC_INIT. But if a FASTOPEN setsockopt is called after a non-blocking connect(), this is broken, and fallback does not make sense. This change complements commit cd2063604ea6 ("net/smc: avoid fallback in case of non-blocking connect") and fixes the syzbot reported problem "WARNING in smc_unhash_sk". Reported-by: syzbot+8488cc4cf1c9e09b8b86@syzkaller.appspotmail.com Fixes: e1bbdd570474 ("net/smc: reduce sock_put() for fallback sockets") Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/smc/af_smc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 8edf1619f0e4..737b49909a7a 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1732,7 +1732,7 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
case TCP_FASTOPEN_KEY:
case TCP_FASTOPEN_NO_COOKIE:
/* option not supported by SMC */
- if (sk->sk_state == SMC_INIT) {
+ if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
smc_switch_to_fallback(smc);
smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
} else {