From: Thomas Graf <tgraf@suug.ch>
Date: Thu, 28 Nov 2013 22:14:38 +0000 (+0100)
Subject: attr: Allow attribute type 0
X-Git-Tag: libnl3_2_24rc1~20
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6a8d90f5fec4;p=thirdparty%2Flibnl.git

attr: Allow attribute type 0

{netlink,packet,unix}_diag use attribute type 0 for valid
attributes. The value was reserved and usage was prohibited
by the protocol but we can't undo the breakge.

Make libnl accept attribute type 0 to allow parsing these
attributes.

Reported-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
---

diff --git a/lib/attr.c b/lib/attr.c
index 535f10c..e83aca2 100644
--- a/lib/attr.c
+++ b/lib/attr.c
@@ -192,7 +192,7 @@ static int validate_nla(struct nlattr *nla, int maxtype,
 	unsigned int minlen = 0;
 	int type = nla_type(nla);
 
-	if (type <= 0 || type > maxtype)
+	if (type < 0 || type > maxtype)
 		return 0;
 
 	pt = &policy[type];