netdev - [PATCH AUTOSEL 6.4 21/40] Bluetooth: L2CAP: Fix use-after-free

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 for Android: free password hash cracker in your pocket

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

Message-Id: <20230724013140.2327815-21-sashal@kernel.org>
Date: Sun, 23 Jul 2023 21:31:21 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Zhengping Jiang <jiangzp@...gle.com>,
	Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	marcel@...tmann.org,
	gustavo@...ovan.org,
	johan.hedberg@...il.com,
	davem@...emloft.net,
	linux-bluetooth@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.4 21/40] Bluetooth: L2CAP: Fix use-after-free

From: Zhengping Jiang <jiangzp@...gle.com>

[ Upstream commit f752a0b334bb95fe9b42ecb511e0864e2768046f ]

Fix potential use-after-free in l2cap_le_command_rej.

Signed-off-by: Zhengping Jiang <jiangzp@...gle.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/bluetooth/l2cap_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index c5e8798e297ca..17ca13e8c044c 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -6374,9 +6374,14 @@ static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
 	if (!chan)
 		goto done;
 
+	chan = l2cap_chan_hold_unless_zero(chan);
+	if (!chan)
+		goto done;
+
 	l2cap_chan_lock(chan);
 	l2cap_chan_del(chan, ECONNREFUSED);
 	l2cap_chan_unlock(chan);
+	l2cap_chan_put(chan);
 
 done:
 	mutex_unlock(&conn->chan_lock);
-- 
2.39.2