netdev - [PATCH] netfilter: properly initialize xt_table

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Message-ID: <20180517084442.GA23981@kroah.com>
Date:   Thu, 17 May 2018 10:44:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        Florian Westphal <fw@...len.de>
Cc:     netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org
Subject: [PATCH] netfilter: properly initialize xt_table_info structure

When allocating a xt_table_info structure, we should be clearing out the
full amount of memory that was allocated, not just the "header" of the
structure.  Otherwise odd values could be passed to userspace, which is
not a good thing.

Cc: stable <stable@...r.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/netfilter/x_tables.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index cb7cb300c3bc..a300e8252bb6 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -1187,7 +1187,7 @@ struct xt_table_info *xt_alloc_table_info(unsigned int size)
 	if (!info)
 		return NULL;
 
-	memset(info, 0, sizeof(*info));
+	memset(info, 0, sz);
 	info->size = size;
 	return info;
 }
-- 
2.17.0