[PATCH 3.13 257/259] dns_resolver: assure that dns_query() result is null-terminated

From: Kamal Mostafa
Date: Fri Aug 08 2014 - 16:46:33 EST


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@xxxxxx>

[ 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 SchÃlling <manuel.schoelling@xxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
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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