From d995cc7e5431873b839269fe22577acfa3b157bd Mon Sep 17 00:00:00 2001 From: Michael Tuexen Date: Mon, 22 Mar 2021 16:40:41 +0100 Subject: [PATCH] sctp: fix handling of RTO.initial of 1 ms MFC after: 3 days Reported by: syzbot+5eb0e009147050056ce9@syzkaller.appspotmail.com --- sys/netinet/sctputil.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/sys/netinet/sctputil.c b/sys/netinet/sctputil.c index 7ddb4c3710df..5d4b3347a2c9 100644 --- a/sys/netinet/sctputil.c +++ b/sys/netinet/sctputil.c @@ -2277,7 +2277,9 @@ sctp_timer_start(int t_type, struct sctp_inpcb *inp, struct sctp_tcb *stcb, } rndval = sctp_select_initial_TSN(&inp->sctp_ep); jitter = rndval % to_ticks; - to_ticks >>= 1; + if (to_ticks > 1) { + to_ticks >>= 1; + } if (jitter < (UINT32_MAX - to_ticks)) { to_ticks += jitter; } else {