[PATCH] Bluetooth: Fix use after free in l2cap_chan_timeout
From: Harish Jenny K N
Date: Thu Mar 19 2015 - 04:20:06 EST
There is a potential use after free in bt_sock_poll when a
socket gets killed without getting unlinked from accept_q.
Hence added code to unlink from accpept_q by calling teardown
before freeing the socket for channel type L2CAP_CHAN_CONN_ORIENTED.
Signed-off-by: Harish Jenny K N <harish_kandiga@xxxxxxxxxx>
---
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 6ba33f9..c6955fb 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -415,6 +415,11 @@ static void l2cap_chan_timeout(struct work_struct *work)
l2cap_chan_close(chan, reason);
+ if ((chan->state == BT_CONNECTED || chan->state == BT_CONFIG) &&
+ chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
+ chan->ops->teardown(chan, 0);
+ }
+
l2cap_chan_unlock(chan);
chan->ops->close(chan);
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/