Linux/linux 8204df7net/smc af_smc.c

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 at syzkaller.appspotmail.com
Fixes: e1bbdd570474 ("net/smc: reduce sock_put() for fallback sockets")
Signed-off-by: Ursula Braun <ubraun at linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul at linux.ibm.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
DeltaFile
+1-1net/smc/af_smc.c
+1-11 files

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