linux-kernel - [PATCH] net, bluetooth: don't attempt to free a channel that wasn't created

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Thu,  4 Oct 2012 19:59:57 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	marcel@...tmann.org, gustavo@...ovan.org, johan.hedberg@...il.com,
	davem@...emloft.net
Cc:	levinsasha928@...il.com, davej@...hat.com,
	linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
	netdev@...r.kernel.org, Sasha Levin <sasha.levin@...cle.com>
Subject: [PATCH] net, bluetooth: don't attempt to free a channel that wasn't created

We may currently attempt to free a channel which wasn't created due to
an error in the initialization path, this would cause a NULL ptr deref.

Introduced in commit 61d6ef3e ("Bluetooth: Make better use of l2cap_chan
reference counting").

Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
---
 net/bluetooth/l2cap_sock.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 083f2bf..66c295a 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -1083,7 +1083,8 @@ static void l2cap_sock_destruct(struct sock *sk)
 {
 	BT_DBG("sk %p", sk);
 
-	l2cap_chan_put(l2cap_pi(sk)->chan);
+	if (l2cap_pi(sk)->chan)
+		l2cap_chan_put(l2cap_pi(sk)->chan);
 	if (l2cap_pi(sk)->rx_busy_skb) {
 		kfree_skb(l2cap_pi(sk)->rx_busy_skb);
 		l2cap_pi(sk)->rx_busy_skb = NULL;
-- 
1.7.12

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/