Date: Sun, 25 Sep 2022 10:05:19 GMT From: Richard Scheffenegger <rscheff@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 0612d3000b97 - stable/13 - tcp: fix computation of offset Message-ID: <202209251005.28PA5JmS047479@gitrepo.freebsd.org>
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The branch stable/13 has been updated by rscheff: URL: https://cgit.FreeBSD.org/src/commit/?id=0612d3000b974f31de15c90c77bf43f121fc8656 commit 0612d3000b974f31de15c90c77bf43f121fc8656 Author: Michael Tuexen <tuexen@FreeBSD.org> AuthorDate: 2022-09-19 10:42:43 +0000 Commit: Richard Scheffenegger <rscheff@FreeBSD.org> CommitDate: 2022-09-25 08:54:18 +0000 tcp: fix computation of offset Only update the offset if actually retransmitting from the scoreboard. If not done correctly, this may result in trying to (re)-transmit data not being being in the socket buffe and therefore resulting in a panic. PR: 264257 PR: 263445 PR: 260393 Reviewed by: rscheff@ MFC after: 3 days Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D36626 (cherry picked from commit 6d9e911fbadf3b409802a211c1dae9b47cb5a2b8) --- sys/netinet/tcp_output.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/sys/netinet/tcp_output.c b/sys/netinet/tcp_output.c index 74721463e622..01dca2ba3ea1 100644 --- a/sys/netinet/tcp_output.c +++ b/sys/netinet/tcp_output.c @@ -334,10 +334,10 @@ again: len = ((int32_t)ulmin(cwin, SEQ_SUB(p->end, p->rxmit))); } - off = SEQ_SUB(p->rxmit, tp->snd_una); - KASSERT(off >= 0,("%s: sack block to the left of una : %d", - __func__, off)); if (len > 0) { + off = SEQ_SUB(p->rxmit, tp->snd_una); + KASSERT(off >= 0,("%s: sack block to the left of una : %d", + __func__, off)); sack_rxmit = 1; sendalot = 1; TCPSTAT_INC(tcps_sack_rexmits);
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