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Date: Wed, 15 May 2019 12:52:57 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, syzbot+659574e7bcc7f7eb4df7@...kaller.appspotmail.com, Florian Westphal <fw@...len.de>, Pablo Neira Ayuso <pablo@...filter.org> Subject: [PATCH 4.4 070/266] netfilter: ebtables: CONFIG_COMPAT: drop a bogus WARN_ON From: Florian Westphal <fw@...len.de> 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: 81e675c227ec ("netfilter: ebtables: add CONFIG_COMPAT support") Reported-by: syzbot+659574e7bcc7f7eb4df7@...kaller.appspotmail.com Signed-off-by: Florian Westphal <fw@...len.de> Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- net/bridge/netfilter/ebtables.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/net/bridge/netfilter/ebtables.c +++ b/net/bridge/netfilter/ebtables.c @@ -2046,7 +2046,8 @@ static int ebt_size_mwt(struct compat_eb 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;
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