| From 9397940ed812b942c520e0c25ed4b2c64d57e8b9 Mon Sep 17 00:00:00 2001 |
| From: Oliver Neukum <oneukum@suse.com> |
| Date: Thu, 4 Oct 2018 15:49:06 +0200 |
| Subject: cdc-acm: fix race between reset and control messaging |
| |
| From: Oliver Neukum <oneukum@suse.com> |
| |
| commit 9397940ed812b942c520e0c25ed4b2c64d57e8b9 upstream. |
| |
| If a device splits up a control message and a reset() happens |
| between the parts, the message is lost and already recieved parts |
| must be dropped. |
| |
| Signed-off-by: Oliver Neukum <oneukum@suse.com> |
| Fixes: 1aba579f3cf51 ("cdc-acm: handle read pipe errors") |
| Cc: stable <stable@vger.kernel.org> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| drivers/usb/class/cdc-acm.c | 1 + |
| 1 file changed, 1 insertion(+) |
| |
| --- a/drivers/usb/class/cdc-acm.c |
| +++ b/drivers/usb/class/cdc-acm.c |
| @@ -1654,6 +1654,7 @@ static int acm_pre_reset(struct usb_inte |
| struct acm *acm = usb_get_intfdata(intf); |
| |
| clear_bit(EVENT_RX_STALL, &acm->flags); |
| + acm->nb_index = 0; /* pending control transfers are lost */ |
| |
| return 0; |
| } |
