From: Manuel Schölling <manuel.schoelling@gmx.de>
Date: Sat, 31 May 2014 21:37:40 +0000 (+0200)
Subject: dns_resolver: Do not accept domain names longer than 255 chars
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9638f6713ff556bdc34e9d18eeb7c1b25b35e5ce;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

dns_resolver: Do not accept domain names longer than 255 chars

According to RFC1035 "[...] the total length of a domain name (i.e.,
label octets and label length octets) is restricted to 255 octets or
less."

Signed-off-by: Manuel Schölling <manuel.schoelling@gmx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/dns_resolver/dns_query.c b/net/dns_resolver/dns_query.c
index e7b6d53eef88..5b499589613f 100644
--- a/net/dns_resolver/dns_query.c
+++ b/net/dns_resolver/dns_query.c
@@ -93,8 +93,8 @@ int dns_query(const char *type, const char *name, size_t namelen,
 	}
 
 	if (!namelen)
-		namelen = strlen(name);
-	if (namelen < 3)
+		namelen = strnlen(name, 256);
+	if (namelen < 3 || namelen > 255)
 		return -EINVAL;
 	desclen += namelen + 1;