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When a checksum has to be computed for a received IPv6 packet because it

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is requested by the application using the IPPROTO_IPV6 level socket option
IPV6_CHECKSUM on a raw socket, ensure that the packet contains enough
bytes to contain the checksum at the specified offset.

Reported by:		syzbot+6295fcc5a8aced81d599@syzkaller.appspotmail.com
Reviewed by:		bz@
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D19968
This commit is contained in:
Michael Tuexen 2019-04-19 17:28:28 +00:00
parent ae7c65b171
commit 70a0f3dcdc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=346402
1 changed files with 2 additions and 1 deletions
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3
sys/netinet6/raw_ip6.c
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@ -239,7 +239,8 @@ rip6_input(struct mbuf **mp, int *offp, int proto)
}
if (in6p->in6p_cksum != -1) {
RIP6STAT_INC(rip6s_isum);
if (in6_cksum(m, proto, *offp,
if (m->m_pkthdr.len - (*offp + in6p->in6p_cksum) < 2 ||
in6_cksum(m, proto, *offp,
m->m_pkthdr.len - *offp)) {
RIP6STAT_INC(rip6s_badsum);
goto skip_2;