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USB: cdc-acm: fix potential urb leak and PM imbalance in write

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Make sure to check return value of autopm get in write() in order to
avoid urb leak and PM counter imbalance on errors.

Fixes: 11ea859d64 ("USB: additional power savings for cdc-acm devices
that support remote wakeup")

Cc: <stable@vger.kernel.org>	# v2.6.27
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2014-05-26 19:23:41 +02:00 committed by Greg Kroah-Hartman
parent ed79707403
commit 183a45087d
1 changed files with 7 additions and 1 deletions
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8
drivers/usb/class/cdc-acm.c
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@ -668,7 +668,13 @@ static int acm_tty_write(struct tty_struct *tty,
memcpy(wb->buf, buf, count);
wb->len = count;
usb_autopm_get_interface_async(acm->control);
stat = usb_autopm_get_interface_async(acm->control);
if (stat) {
wb->use = 0;
spin_unlock_irqrestore(&acm->write_lock, flags);
return stat;
}
if (acm->susp_count) {
usb_anchor_urb(wb->urb, &acm->delayed);
spin_unlock_irqrestore(&acm->write_lock, flags);