Patch "ALSA: caiaq: Fix stray URB at probe error path" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    ALSA: caiaq: Fix stray URB at probe error path

to the 4.4-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:
     alsa-caiaq-fix-stray-urb-at-probe-error-path.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 99fee508245825765ff60155fed43f970ff83a8f Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Wed, 11 Oct 2017 16:39:02 +0200
Subject: ALSA: caiaq: Fix stray URB at probe error path

From: Takashi Iwai <tiwai@suse.de>

commit 99fee508245825765ff60155fed43f970ff83a8f upstream.

caiaq driver doesn't kill the URB properly at its error path during
the probe, which may lead to a use-after-free error later.  This patch
addresses it.

Reported-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 sound/usb/caiaq/device.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

--- a/sound/usb/caiaq/device.c
+++ b/sound/usb/caiaq/device.c
@@ -469,10 +469,12 @@ static int init_card(struct snd_usb_caia
 
 	err = snd_usb_caiaq_send_command(cdev, EP1_CMD_GET_DEVICE_INFO, NULL, 0);
 	if (err)
-		return err;
+		goto err_kill_urb;
 
-	if (!wait_event_timeout(cdev->ep1_wait_queue, cdev->spec_received, HZ))
-		return -ENODEV;
+	if (!wait_event_timeout(cdev->ep1_wait_queue, cdev->spec_received, HZ)) {
+		err = -ENODEV;
+		goto err_kill_urb;
+	}
 
 	usb_string(usb_dev, usb_dev->descriptor.iManufacturer,
 		   cdev->vendor_name, CAIAQ_USB_STR_LEN);
@@ -507,6 +509,10 @@ static int init_card(struct snd_usb_caia
 
 	setup_card(cdev);
 	return 0;
+
+ err_kill_urb:
+	usb_kill_urb(&cdev->ep1_in_urb);
+	return err;
 }
 
 static int snd_probe(struct usb_interface *intf,


Patches currently in stable-queue which might be from tiwai@suse.de are

queue-4.4/alsa-caiaq-fix-stray-urb-at-probe-error-path.patch
queue-4.4/alsa-seq-fix-copy_from_user-call-inside-lock.patch
queue-4.4/alsa-seq-fix-use-after-free-at-creating-a-port.patch
queue-4.4/alsa-line6-fix-leftover-urb-at-error-path-during-probe.patch
queue-4.4/alsa-usb-audio-kill-stray-urb-at-exiting.patch