lkml.org 
[lkml]   [2014]   [Jul]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3.11 070/198] USB: cdc-acm: fix potential urb leak and PM imbalance in write
Date
3.11.10.13 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <jhovold@gmail.com>

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@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
drivers/usb/class/cdc-acm.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 014a1aa3f950..dc5cfa5a1118 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -654,7 +654,13 @@ 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);
--
1.9.1


\
 
 \ /
  Last update: 2014-07-03 12:41    [W:0.590 / U:0.188 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site