This is a note to let you know that I've just added the patch titled
USB: cdc-acm: fix potential urb leak and PM imbalance in write
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-cdc-acm-fix-potential-urb-leak-and-pm-imbalance-in-write.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 183a45087d126d126e8dd1d9b2602fc129dff9ad Mon Sep 17 00:00:00 2001
From: Johan Hovold <jhovold@xxxxxxxxx>
Date: Mon, 26 May 2014 19:23:41 +0200
Subject: USB: cdc-acm: fix potential urb leak and PM imbalance in write
From: Johan Hovold <jhovold@xxxxxxxxx>
commit 183a45087d126d126e8dd1d9b2602fc129dff9ad upstream.
Make sure to check return value of autopm get in write() in order to
avoid urb leak and PM counter imbalance on errors.
Fixes: 11ea859d64b6 ("USB: additional power savings for cdc-acm devices
that support remote wakeup")
Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/class/cdc-acm.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -668,7 +668,13 @@ static int acm_tty_write(struct tty_stru
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);
Patches currently in stable-queue which might be from jhovold@xxxxxxxxx are
queue-3.15/usb-cdc-acm-fix-i-o-after-failed-open.patch
queue-3.15/usb-cdc-acm-fix-write-and-resume-race.patch
queue-3.15/usb-cdc-acm-fix-runtime-pm-for-control-messages.patch
queue-3.15/usb-cdc-acm-fix-broken-runtime-suspend.patch
queue-3.15/usb-cdc-acm-fix-open-and-suspend-race.patch
queue-3.15/usb-cdc-acm-fix-potential-urb-leak-and-pm-imbalance-in-write.patch
queue-3.15/usb-cdc-acm-fix-runtime-pm-imbalance-at-shutdown.patch
queue-3.15/usb-cdc-acm-fix-shutdown-and-suspend-race.patch
queue-3.15/usb-cdc-acm-fix-write-and-suspend-race.patch
queue-3.15/usb-cdc-acm-fix-failed-open-not-being-detected.patch
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