linux-kernel - [PATCH 3.12 31/88] netfilter: x_tables: assert minimum target size

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Message-Id: <f72d01d85914ff18ab3f70c97ab42173b81223e5.1468483951.git.jslaby@suse.cz>
Date:	Thu, 14 Jul 2016 10:15:23 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Florian Westphal <fw@...len.de>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 31/88] netfilter: x_tables: assert minimum target size

From: Florian Westphal <fw@...len.de>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit a08e4e190b866579896c09af59b3bdca821da2cd upstream.

The target size includes the size of the xt_entry_target struct.

Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 net/netfilter/x_tables.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 55b1e0ccb0e2..cc34bb38c814 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -587,6 +587,9 @@ int xt_check_entry_offsets(const void *base,
 		return -EINVAL;
 
 	t = (void *)(e + target_offset);
+	if (t->u.target_size < sizeof(*t))
+		return -EINVAL;
+
 	if (target_offset + t->u.target_size > next_offset)
 		return -EINVAL;
 
-- 
2.9.1