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netfilter: nft_osf: add missing check for DREG attribute

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syzbot reports just another NULL deref crash because of missing test
for presence of the attribute.

Reported-by: syzbot+cf23983d697c26c34f60@syzkaller.appspotmail.com
Fixes:  b96af92d6e ("netfilter: nf_tables: implement Passive OS fingerprint module in nft_osf")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2020-01-18 11:27:25 +01:00 committed by Pablo Neira Ayuso
parent e02d9c4c68
commit 7eaecf7963
1 changed files with 3 additions and 0 deletions
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3
net/netfilter/nft_osf.c
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@ -61,6 +61,9 @@ static int nft_osf_init(const struct nft_ctx *ctx,
int err;
u8 ttl;
if (!tb[NFTA_OSF_DREG])
return -EINVAL;
if (tb[NFTA_OSF_TTL]) {
ttl = nla_get_u8(tb[NFTA_OSF_TTL]);
if (ttl > 2)