4.18-stable review patch. If anyone has any objections, please let me know.
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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 @@ -1641,6 +1641,7 @@ 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; }