This is a note to let you know that I've just added the patch titled
Bluetooth: L2CAP: Fix use-after-free
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bluetooth-l2cap-fix-use-after-free.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bf66bf13724ac68d7ab5383887f0a31ffa7cda02
Author: Zhengping Jiang <jiangzp@xxxxxxxxxx>
Date: Wed May 24 17:04:15 2023 -0700
Bluetooth: L2CAP: Fix use-after-free
[ Upstream commit f752a0b334bb95fe9b42ecb511e0864e2768046f ]
Fix potential use-after-free in l2cap_le_command_rej.
Signed-off-by: Zhengping Jiang <jiangzp@xxxxxxxxxx>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index fcc471f921895..9346fae5d664b 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -5705,9 +5705,14 @@ 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);
