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Message-Id: <20200116172403.18149-140-sashal@kernel.org>
Date: Thu, 16 Jan 2020 12:21:09 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Florian Westphal <fw@...len.de>,
Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
Pablo Neira Ayuso <pablo@...filter.org>,
Sasha Levin <sashal@...nel.org>,
netfilter-devel@...r.kernel.org, coreteam@...filter.org,
bridge@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 197/371] netfilter: ebtables: CONFIG_COMPAT: reject trailing data after last rule
From: Florian Westphal <fw@...len.de>
[ Upstream commit 680f6af5337c98d116e4f127cea7845339dba8da ]
If userspace provides a rule blob with trailing data after last target,
we trigger a splat, then convert ruleset to 64bit format (with trailing
data), then pass that to do_replace_finish() which then returns -EINVAL.
Erroring out right away avoids the splat plus unneeded translation and
error unwind.
Fixes: 81e675c227ec ("netfilter: ebtables: add CONFIG_COMPAT support")
Reported-by: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
net/bridge/netfilter/ebtables.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 35a670ec9077..a1834ad7422c 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -2164,7 +2164,9 @@ static int compat_copy_entries(unsigned char *data, unsigned int size_user,
if (ret < 0)
return ret;
- WARN_ON(size_remaining);
+ if (size_remaining)
+ return -EINVAL;
+
return state->buf_kern_offset;
}
--
2.20.1
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