Bjørn Mork f563926fed usb: cdc-wdm: resp_count can be 0 even if WDM_READ is set ... Do not decrement resp_count if it's already 0. We set resp_count to 0 when the device is closed. The next open and read will try to clear the WDM_READ flag if there was leftover data in the read buffer. This fix is necessary to prevent resubmitting the read URB in a tight loop because resp_count becomes negative. The bug can easily be triggered from userspace by not reading all data in the read buffer, and then closing and reopening the chardev. Fixes: 8dd5cd5395 ("usb: cdc-wdm: avoid hanging on zero length reads") Cc: <stable@vger.kernel.org> # 3.13 Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2014-01-12 20:13:28 -08:00
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cdc-acm.c	Merge branch 3.13-rc4 into usb-next	2013-12-16 08:46:03 -08:00
cdc-acm.h	cdc-acm: add TIOCMIWAIT	2013-12-03 10:23:46 -08:00
cdc-wdm.c	usb: cdc-wdm: resp_count can be 0 even if WDM_READ is set	2014-01-12 20:13:28 -08:00
Kconfig	USB: regroup all depends on USB within an if USB block	2013-04-09 16:49:07 -07:00
Makefile	USB: add USB test and measurement class driver	2008-10-17 14:40:51 -07:00
usblp.c	usb: delete non-required instances of include <linux/init.h>	2014-01-08 15:01:39 -08:00
usbtmc.c	usb: delete non-required instances of include <linux/init.h>	2014-01-08 15:01:39 -08:00