aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb
diff options
context:
space:
mode:
authorJohan Hovold <jhovold@gmail.com>2011-03-22 11:12:11 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2011-03-27 11:30:49 -0700
commitbd1e7bc1dd3a4a70a0885cc674746834b13d23d4 (patch)
tree79174f5dec588da3bae74dcabf50dd112c55b390 /drivers/usb
parent84241926c6de00e379993d71d7790f3863aa3a71 (diff)
downloadlinux-linaro-stable-bd1e7bc1dd3a4a70a0885cc674746834b13d23d4.tar.gz
USB: cdc-acm: fix potential null-pointer dereference on disconnect
commit 7e7797e7f6f7bfab73fca02c65e40eaa5bb9000c upstream. Fix potential null-pointer exception on disconnect introduced by commit 11ea859d64b69a747d6b060b9ed1520eab1161fe (USB: additional power savings for cdc-acm devices that support remote wakeup). Only access acm->dev after making sure it is non-null in control urb completion handler. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/class/cdc-acm.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 7512dfdb7e0f..4e32da6a6d5d 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -297,6 +297,8 @@ static void acm_ctrl_irq(struct urb *urb)
if (!ACM_READY(acm))
goto exit;
+ usb_mark_last_busy(acm->dev);
+
data = (unsigned char *)(dr + 1);
switch (dr->bNotificationType) {
case USB_CDC_NOTIFY_NETWORK_CONNECTION:
@@ -336,7 +338,6 @@ static void acm_ctrl_irq(struct urb *urb)
break;
}
exit:
- usb_mark_last_busy(acm->dev);
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval)
dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with "