linux-kernel - [PATCH v2] dns_resolver: assure that dns

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Message-Id: <1402167681-24676-1-git-send-email-manuel.schoelling@gmx.de>
Date:	Sat,  7 Jun 2014 21:01:21 +0200
From:	Manuel Schölling <manuel.schoelling@....de>
To:	davem@...emloft.net
Cc:	jeffrey.t.kirsher@...el.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Manuel Schölling <manuel.schoelling@....de>
Subject: [PATCH v2] dns_resolver: assure that dns_query() result is null-terminated

dns_query() credulously assumes that keys are null-terminated and
returns a copy of a memory block that is off by one.
---
 net/dns_resolver/dns_query.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/dns_resolver/dns_query.c b/net/dns_resolver/dns_query.c
index e7b6d53..84871a2 100644
--- a/net/dns_resolver/dns_query.c
+++ b/net/dns_resolver/dns_query.c
@@ -145,11 +145,11 @@ int dns_query(const char *type, const char *name, size_t namelen,
 	len = upayload->datalen;
 
 	ret = -ENOMEM;
-	*_result = kmalloc(len + 1, GFP_KERNEL);
+	*_result = kzalloc(len + 1, GFP_KERNEL);
 	if (!*_result)
 		goto put;
 
-	memcpy(*_result, upayload->data, len + 1);
+	memcpy(*_result, upayload->data, len);
 	if (_expiry)
 		*_expiry = rkey->expiry;
 
-- 
1.7.10.4

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