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netfilter: nft_osf: check if attribute is present 

If the attribute is not sent, eg. old libnftnl binary, then
tb[NFTA_OSF_TTL] is NULL and kernel crashes from the _init path.

Fixes: a218dc82f0 ("netfilter: nft_osf: Add ttl option support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2018-10-22 21:49:45 +02:00
parent 61792b6774
commit 5e91c9d9cd
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nft_osf.c
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@ -50,7 +50,7 @@ static int nft_osf_init(const struct nft_ctx *ctx,
int err;
u8 ttl;
if (nla_get_u8(tb[NFTA_OSF_TTL])) {
if (tb[NFTA_OSF_TTL]) {
ttl = nla_get_u8(tb[NFTA_OSF_TTL]);
if (ttl > 2)
return -EINVAL;