linux-kernel - [PATCH 3.12 56/94] dns_resolver: assure that dns

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Message-Id: <d48784b054635ec818cfe3959249de5b2f43ea6a.1406722270.git.jslaby@suse.cz>
Date:	Wed, 30 Jul 2014 14:14:45 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Manuel Schölling <manuel.schoelling@....de>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 56/94] dns_resolver: assure that dns_query() result is null-terminated

From: Manuel Schölling <manuel.schoelling@....de>

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

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

[ Upstream commit 84a7c0b1db1c17d5ded8d3800228a608e1070b40 ]

dns_query() credulously assumes that keys are null-terminated and
returns a copy of a memory block that is off by one.

Signed-off-by: Manuel Schölling <manuel.schoelling@....de>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 net/dns_resolver/dns_query.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/dns_resolver/dns_query.c b/net/dns_resolver/dns_query.c
index c32be292c7e3..ede0e2d7412e 100644
--- a/net/dns_resolver/dns_query.c
+++ b/net/dns_resolver/dns_query.c
@@ -150,7 +150,9 @@ int dns_query(const char *type, const char *name, size_t namelen,
 	if (!*_result)
 		goto put;
 
-	memcpy(*_result, upayload->data, len + 1);
+	memcpy(*_result, upayload->data, len);
+	*_result[len] = '\0';
+
 	if (_expiry)
 		*_expiry = rkey->expiry;
 
-- 
2.0.1

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