netfilter: nft_exthdr: fix error handling in nft_exthdr_init()

"err" needs to be signed for the error handling to work.

Fixes: 848a218f9363 ('netfilter: nf_tables: validate maximum value of u32 netlink attributes')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nft_exthdr.c b/net/netfilter/nft_exthdr.c
index a84cf3d6605661aa8bb8966e226a79ea1b63786a..47beb3abcc9daf46e084c0f189eaf7091d11241e 100644 (file)
--- a/net/netfilter/nft_exthdr.c
+++ b/net/netfilter/nft_exthdr.c
@@ -59,7 +59,8 @@ static int nft_exthdr_init(const struct nft_ctx *ctx,
                           const struct nlattr * const tb[])
 {
        struct nft_exthdr *priv = nft_expr_priv(expr);
-       u32 offset, len, err;
+       u32 offset, len;
+       int err;
 
        if (tb[NFTA_EXTHDR_DREG] == NULL ||
            tb[NFTA_EXTHDR_TYPE] == NULL ||