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Bluetooth: L2CAP: Fix user-after-free 

This uses l2cap_chan_hold_unless_zero() after calling
__l2cap_get_chan_blah() to prevent the following trace:

Bluetooth: l2cap_core.c:static void l2cap_chan_destroy(struct kref
*kref)
Bluetooth: chan 0000000023c4974d
Bluetooth: parent 00000000ae861c08
==================================================================
BUG: KASAN: use-after-free in __mutex_waiter_is_first
kernel/locking/mutex.c:191 [inline]
BUG: KASAN: use-after-free in __mutex_lock_common
kernel/locking/mutex.c:671 [inline]
BUG: KASAN: use-after-free in __mutex_lock+0x278/0x400
kernel/locking/mutex.c:729
Read of size 8 at addr ffff888006a49b08 by task kworker/u3:2/389

Link: https://lore.kernel.org/lkml/20220622082716.478486-1-lee.jones@linaro.org
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sungwoo Kim <iam@sung-woo.kim>
This commit is contained in:
Luiz Augusto von Dentz 2022-09-29 13:27:13 -07:00
parent 8dbc3e75a0
commit 35fcbc4243
1 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
net/bluetooth/l2cap_core.c
View File

@ -4309,6 +4309,12 @@ static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
}
}
chan = l2cap_chan_hold_unless_zero(chan);
if (!chan) {
err = -EBADSLT;
goto unlock;
}
err = 0;
l2cap_chan_lock(chan);
@ -4338,6 +4344,7 @@ static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
}
l2cap_chan_unlock(chan);
l2cap_chan_put(chan);
unlock:
mutex_unlock(&conn->chan_lock);