net/smc: add fallback check to connect()
FASTOPEN setsockopt() or sendmsg() may switch the SMC socket to fallback mode. Once fallback mode is active, the native TCP socket functions are called. Nevertheless there is a small race window, when FASTOPEN setsockopt/sendmsg runs in parallel to a connect(), and switch the socket into fallback mode before connect() takes the sock lock. Make sure the SMC-specific connect setup is omitted in this case. This way a syzbot-reported refcount problem is fixed, triggered by different threads running non-blocking connect() and FASTOPEN_KEY setsockopt. Reported-by:<syzbot+96d3f9ff6a86d37e44c8@syzkaller.appspotmail.com> Fixes: 6d6dd528 ("net/smc: fix refcount non-blocking connect() -part 2") Signed-off-by:
Ursula Braun <ubraun@linux.ibm.com> Signed-off-by:
Karsten Graul <kgraul@linux.ibm.com> Signed-off-by:
Jakub Kicinski <jakub.kicinski@netronome.com>
parent
9b2079c0
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