linux-kernel - [PATCH 4.12 78/99] netfilter: expect: fix crash when putting uninited expectation

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Message-Id: <20170828080459.365428562@linuxfoundation.org>
Date:   Mon, 28 Aug 2017 10:05:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sergey Kvachonok <ravenexp@...il.com>,
        Gao Feng <fgao@...ai8.com>, Florian Westphal <fw@...len.de>,
        Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH 4.12 78/99] netfilter: expect: fix crash when putting uninited expectation

4.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Florian Westphal <fw@...len.de>

commit 36ac344e16e04e3e55e8fed7446095a6458c64e6 upstream.

We crash in __nf_ct_expect_check, it calls nf_ct_remove_expect on the
uninitialised expectation instead of existing one, so del_timer chokes
on random memory address.

Fixes: ec0e3f01114ad32711243 ("netfilter: nf_ct_expect: Add nf_ct_remove_expect()")
Reported-by: Sergey Kvachonok <ravenexp@...il.com>
Tested-by: Sergey Kvachonok <ravenexp@...il.com>
Cc: Gao Feng <fgao@...ai8.com>
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/netfilter/nf_conntrack_expect.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/netfilter/nf_conntrack_expect.c
+++ b/net/netfilter/nf_conntrack_expect.c
@@ -422,7 +422,7 @@ static inline int __nf_ct_expect_check(s
 	h = nf_ct_expect_dst_hash(net, &expect->tuple);
 	hlist_for_each_entry_safe(i, next, &nf_ct_expect_hash[h], hnode) {
 		if (expect_matches(i, expect)) {
-			if (nf_ct_remove_expect(expect))
+			if (nf_ct_remove_expect(i))
 				break;
 		} else if (expect_clash(i, expect)) {
 			ret = -EBUSY;