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>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/attr.c b/lib/attr.c
index 535f10ca..e83aca2c 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];