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netfilter: ebtables: CONFIG_COMPAT: drop a bogus WARN_ON 

commit 7caa56f006e9d712b44f27b32520c66420d5cbc6 upstream.

It means userspace gave us a ruleset where there is some other
data after the ebtables target but before the beginning of the next rule.

Fixes: 81e675c227 ("netfilter: ebtables: add CONFIG_COMPAT support")
Reported-by: syzbot+659574e7bcc7f7eb4df7@syzkaller.appspotmail.com
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Florian Westphal 2019-04-15 00:43:00 +02:00 committed by syphyr
parent 0b7f7c5cf9
commit 8325b5e0e4
1 changed files with 2 additions and 1 deletions
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3
net/bridge/netfilter/ebtables.c
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@ -2011,7 +2011,8 @@ static int ebt_size_mwt(struct compat_ebt_entry_mwt *match32,
if (match_kern)
match_kern->match_size = ret;
if (WARN_ON(type == EBT_COMPAT_TARGET && size_left))
/* rule should have no remaining data after target */
if (type == EBT_COMPAT_TARGET && size_left)
return -EINVAL;
match32 = (struct compat_ebt_entry_mwt *) buf;