netfilter: x_tables: fix int overflow in xt_alloc_table_info()

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commit 889c604fd0 upstream.

syzkaller triggered OOM kills by passing ipt_replace.size = -1
to IPT_SO_SET_REPLACE. The root cause is that SMP_ALIGN() in
xt_alloc_table_info() causes int overflow and the size check passes
when it should not. SMP_ALIGN() is no longer needed leftover.

Remove SMP_ALIGN() call in xt_alloc_table_info().

Reported-by: syzbot+4396883fa8c4f64e0175@syzkaller.appspotmail.com
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Dmitry Vyukov 2017-12-28 09:48:54 +01:00 • committed by Greg Kroah-Hartman

parent 4249e8af81

commit 6609d11222

1 changed files with 1 additions and 2 deletions

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net/netfilter/x_tables.c

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