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USB: don't read past config->interface[] if usb_control_msg() fails in usb_reset_configuration()

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While looping over the interfaces, if usb_hcd_alloc_bandwidth() fails it calls
hcd->driver->reset_bandwidth(), so there was no need to reinstate the interface
again.

If no break occurred, the index equals config->desc.bNumInterfaces. A
subsequent usb_control_msg() failure resulted in a read from
config->interface[config->desc.bNumInterfaces] at label reset_old_alts.

In either case the last interface should be skipped.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Roel Kluin 2010-02-18 02:36:23 +01:00 committed by Greg Kroah-Hartman
parent b6a2f10ca0
commit e4a3d94658
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/core/message.c
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@ -1471,7 +1471,7 @@ int usb_reset_configuration(struct usb_device *dev)
/* If not, reinstate the old alternate settings */ /* If not, reinstate the old alternate settings */
if (retval < 0) { if (retval < 0) {
reset_old_alts: reset_old_alts:
for (; i >= 0; i--) { for (i--; i >= 0; i--) {
struct usb_interface *intf = config->interface[i]; struct usb_interface *intf = config->interface[i];
struct usb_host_interface *alt; struct usb_host_interface *alt;