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netfilter: nft_tunnel: fix null-attribute check 

else we get null deref when one of the attributes is missing, both
must be non-null.

Reported-by: syzbot+76d0b80493ac881ff77b@syzkaller.appspotmail.com
Fixes: aaecfdb5c5 ("netfilter: nf_tables: match on tunnel metadata")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2020-01-16 08:44:11 +01:00 committed by Pablo Neira Ayuso
parent ec7470b834
commit 1c702bf902
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nft_tunnel.c
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@ -76,7 +76,7 @@ static int nft_tunnel_get_init(const struct nft_ctx *ctx,
struct nft_tunnel *priv = nft_expr_priv(expr);
u32 len;
if (!tb[NFTA_TUNNEL_KEY] &&
if (!tb[NFTA_TUNNEL_KEY] ||
!tb[NFTA_TUNNEL_DREG])
return -EINVAL;