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netfilter: ctnetlink: must check mark attributes vs NULL 

else we will oops (null deref) when the attributes aren't present.

Also add back the EOPNOTSUPP in case MARK filtering is requested but
kernel doesn't support it.

Fixes: 59c08c69c2 ("netfilter: ctnetlink: Support L3 protocol-filter on flush")
Reported-by: syzbot+e45eda8eda6e93a03959@syzkaller.appspotmail.com
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2018-09-20 23:53:06 +02:00 committed by Pablo Neira Ayuso
parent 0de22baabc
commit 9306425b70
1 changed files with 9 additions and 2 deletions
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11
net/netfilter/nf_conntrack_netlink.c
View File

@ -832,6 +832,11 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
{
struct ctnetlink_filter *filter;
#ifndef CONFIG_NF_CONNTRACK_MARK
if (cda[CTA_MARK] && cda[CTA_MARK_MASK])
return ERR_PTR(-EOPNOTSUPP);
#endif
filter = kzalloc(sizeof(*filter), GFP_KERNEL);
if (filter == NULL)
return ERR_PTR(-ENOMEM);
@ -839,8 +844,10 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
filter->family = family;
#ifdef CONFIG_NF_CONNTRACK_MARK
filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
}
#endif
return filter;
}