On Tue, Aug 04, 2020 at 05:39:37PM +0800, Coiby Xu wrote: > When L2CAP channel is destroyed by hci_unregister_dev, it will > acquire the spin lock of the (struct l2cap_chan *)->tx_q list to > delete all the buffers. But sometimes when hci_unregister_dev is > being called, this lock may have not bee initialized. Initialize > the TX queue lock when creating struct l2cap_chan in 6LOWPAN to fix > this problem. > > Reported-by: syzbot+fadfba6a911f6bf71842@xxxxxxxxxxxxxxxxxxxxxxxxx > Link: https://syzkaller.appspot.com/bug?extid=fadfba6a911f6bf71842 > Signed-off-by: Coiby Xu <coiby.xu@xxxxxxxxx> > --- > net/bluetooth/6lowpan.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c > index bb55d92691b0..713c618a73df 100644 > --- a/net/bluetooth/6lowpan.c > +++ b/net/bluetooth/6lowpan.c > @@ -651,6 +651,7 @@ static struct l2cap_chan *chan_create(void) > > l2cap_chan_set_defaults(chan); > > + skb_queue_head_init(&chan->tx_q); > chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; > chan->mode = L2CAP_MODE_LE_FLOWCTL; > chan->imtu = 1280; Nice, did syzbot verify that this resolves the issue? thanks, greg k-h
