diff options
| author | Florian Westphal <fw@strlen.de> | 2022-05-17 21:49:18 +0200 |
|---|---|---|
| committer | Florian Westphal <fw@strlen.de> | 2022-05-26 23:02:44 +0200 |
| commit | 0f72f32ff4dbe72dffb87ab02b504b838581c9de (patch) | |
| tree | 41b1771326c5fe345f91f337697c1cfedbd9c721 | |
| parent | 558254b0b602b8605d7246a10cfeb584b1fcabfc (diff) | |
| download | nf-0f72f32ff4dbe72dffb87ab02b504b838581c9de.tar.gz | |
netfilter: conntrack: re-fetch conntrack after insertion
In case the conntrack is clashing, insertion can free skb->_nfct and
set skb->_nfct to the already-confirmed entry.
This wasn't found before because the conntrack entry and the extension
space used to free'd after an rcu grace period, plus the race needs
events enabled to trigger.
Reported-by: <syzbot+793a590957d9c1b96620@syzkaller.appspotmail.com>
Fixes: 71d8c47fc653 ("netfilter: conntrack: introduce clash resolution on insertion race")
Fixes: 2ad9d7747c10 ("netfilter: conntrack: free extension area immediately")
Signed-off-by: Florian Westphal <fw@strlen.de>
| -rw-r--r-- | include/net/netfilter/nf_conntrack_core.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/net/netfilter/nf_conntrack_core.h b/include/net/netfilter/nf_conntrack_core.h index 6406cfee34c2d6..37866c8386e234 100644 --- a/include/net/netfilter/nf_conntrack_core.h +++ b/include/net/netfilter/nf_conntrack_core.h @@ -58,8 +58,13 @@ static inline int nf_conntrack_confirm(struct sk_buff *skb) int ret = NF_ACCEPT; if (ct) { - if (!nf_ct_is_confirmed(ct)) + if (!nf_ct_is_confirmed(ct)) { ret = __nf_conntrack_confirm(skb); + + if (ret == NF_ACCEPT) + ct = (struct nf_conn *)skb_nfct(skb); + } + if (ret == NF_ACCEPT && nf_ct_ecache_exist(ct)) nf_ct_deliver_cached_events(ct); } |