From: "Manuel Schölling" <manuel.schoelling@gmx.de>
To: davem@davemloft.net
Cc: jeffrey.t.kirsher@intel.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
"Manuel Schölling" <manuel.schoelling@gmx.de>
Subject: [PATCH] dns_resolver: assure that dns_query() result is null-terminated
Date: Sat, 7 Jun 2014 19:56:51 +0200 [thread overview]
Message-ID: <1402163811-21604-1-git-send-email-manuel.schoelling@gmx.de> (raw)
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, 3 insertions(+), 1 deletion(-)
diff --git a/net/dns_resolver/dns_query.c b/net/dns_resolver/dns_query.c
index e7b6d53..53be635 100644
--- a/net/dns_resolver/dns_query.c
+++ b/net/dns_resolver/dns_query.c
@@ -149,7 +149,9 @@ 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+1] = '\0';
+
if (_expiry)
*_expiry = rkey->expiry;
--
1.7.10.4
next reply other threads:[~2014-06-07 17:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-07 17:56 Manuel Schölling [this message]
2014-06-07 18:54 ` [PATCH] dns_resolver: assure that dns_query() result is null-terminated Trond Myklebust
2014-06-07 18:57 ` Manuel Schoelling
2014-06-07 19:01 ` [PATCH v2] " Manuel Schölling
2014-06-07 21:42 ` David Rientjes
2014-06-07 21:53 ` Manuel Schoelling
2014-06-07 22:02 ` David Rientjes
2014-06-07 21:57 ` Sergei Shtylyov
2014-06-07 21:57 ` [PATCH v3] " Manuel Schölling
2014-06-11 7:12 ` David Miller
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