Subject: [patch] netfilter: nf_tables: underflow in nft_parse_u32_check()

From: Dan Carpenter <[email-masked]>
Date: Wed, 12 Oct 2016 09:08:11 +0300

We don't want to allow negatives here.

Fixes: 36b701fae12a ('netfilter: nf_tables: validate maximum value of u32 netlink attributes')
Signed-off-by: Dan Carpenter <[email-masked]>

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index b70d3ea..dd55187 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4423,7 +4423,7 @@ static int nf_tables_check_loops(const struct nft_ctx *ctx,
  */
 unsigned int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
 {
-	int val;
+	uint val;
 
 	val = ntohl(nla_get_be32(attr));
 	if (val > max)