netfilter: x_tables: avoid out-of-bounds reads in xt_request_find_{match|target}

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It looks like syzbot found its way into netfilter territory.

Issue here is that @name comes from user space and might
not be null terminated.

Out-of-bound reads happen, KASAN is not happy.

v2 added similar fix for xt_request_find_target(),
as Florian advised.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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Eric Dumazet 2018-01-24 17:16:09 -08:00 • committed by Pablo Neira Ayuso

parent 889c604fd0

commit da17c73b6e

1 changed files with 6 additions and 0 deletions

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net/netfilter/x_tables.c

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