linux-kernel - [PATCH 3.13 257/259] dns_resolver: assure that dns

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Message-Id: <1407530482-4483-258-git-send-email-kamal@canonical.com>
Date:	Fri,  8 Aug 2014 13:41:20 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Manuel Schölling <manuel.schoelling@....de>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 257/259] dns_resolver: assure that dns_query() result is null-terminated

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

------------------

From: =?UTF-8?q?Manuel=20Sch=C3=B6lling?= <manuel.schoelling@....de>

[ 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: Kamal Mostafa <kamal@...onical.com>
---
 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 c32be29..ede0e2d 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;
 
-- 
1.9.1

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