Date: Sun, 30 May 2021 10:31:09 GMT From: "Alexander V. Chernikov" <melifaro@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: d40def01a4f4 - stable/13 - Fix a use after free in update_rtm_from_rc(). Message-ID: <202105301031.14UAV9Vm014705@gitrepo.freebsd.org>
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The branch stable/13 has been updated by melifaro: URL: https://cgit.FreeBSD.org/src/commit/?id=d40def01a4f4fed65329f4a74792cad3134eeb29 commit d40def01a4f4fed65329f4a74792cad3134eeb29 Author: Alexander V. Chernikov <melifaro@FreeBSD.org> AuthorDate: 2021-05-14 16:03:08 +0000 Commit: Alexander V. Chernikov <melifaro@FreeBSD.org> CommitDate: 2021-05-30 10:30:53 +0000 Fix a use after free in update_rtm_from_rc(). update_rtm_from_rc() calls update_rtm_from_info() internally. The latter one may update provided prtm pointer with a new rtm. Reassign rtm from prtm afeter calling update_rtm_from_info() to avoid touching the freed rtm. PR: 255871 Submitted by: lylgood@foxmail.com --- sys/net/rtsock.c | 1 + 1 file changed, 1 insertion(+) diff --git a/sys/net/rtsock.c b/sys/net/rtsock.c index 6930bd167ac1..3cb645f42e4c 100644 --- a/sys/net/rtsock.c +++ b/sys/net/rtsock.c @@ -976,6 +976,7 @@ update_rtm_from_rc(struct rt_addrinfo *info, struct rt_msghdr **prtm, if ((error = update_rtm_from_info(info, prtm, alloc_len)) != 0) return (error); + rtm = *prtm; rtm->rtm_flags = rc->rc_rt->rte_flags | nhop_get_rtflags(nh); if (rtm->rtm_flags & RTF_GWFLAG_COMPAT) rtm->rtm_flags = RTF_GATEWAY |
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