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Revert "netfilter: conntrack: fix race in __nf_conntrack_confirm against get_next_corpse"

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This reverts commit 5195c14c8b.

If the conntrack clashes with an existing one, it is left out of
the unconfirmed list, thus, crashing when dropping the packet and
releasing the conntrack since golden rule is that conntracks are
always placed in any of the existing lists for traceability reasons.

Reported-by: Daniel Borkmann <dborkman@redhat.com>
Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=88841
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pablo Neira 2014-11-25 19:54:47 +01:00 committed by David S. Miller
parent 814f7d115e
commit 43612d7c04
1 changed files with 6 additions and 8 deletions
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14
net/netfilter/nf_conntrack_core.c
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@ -611,16 +611,12 @@ __nf_conntrack_confirm(struct sk_buff *skb)
*/
NF_CT_ASSERT(!nf_ct_is_confirmed(ct));
pr_debug("Confirming conntrack %p\n", ct);
/* We have to check the DYING flag after unlink to prevent
* a race against nf_ct_get_next_corpse() possibly called from
* user context, else we insert an already 'dead' hash, blocking
* further use of that particular connection -JM.
*/
nf_ct_del_from_dying_or_unconfirmed_list(ct);
/* We have to check the DYING flag inside the lock to prevent
a race against nf_ct_get_next_corpse() possibly called from
user context, else we insert an already 'dead' hash, blocking
further use of that particular connection -JM */
if (unlikely(nf_ct_is_dying(ct))) {
nf_ct_add_to_dying_list(ct);
nf_conntrack_double_unlock(hash, reply_hash);
local_bh_enable();
return NF_ACCEPT;
@ -640,6 +636,8 @@ __nf_conntrack_confirm(struct sk_buff *skb)
zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h)))
goto out;
nf_ct_del_from_dying_or_unconfirmed_list(ct);
/* Timer relative to confirmation time, not original
setting time, otherwise we'd get timer wrap in
weird delay cases. */