This is a note to let you know that I've just added the patch titled ALSA: line6: Fix NULL dereference at podhd_disconnect() to the 4.13-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-line6-fix-null-dereference-at-podhd_disconnect.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 54a4b2b45817ea2365b40c923c098a26af0c0dbb Mon Sep 17 00:00:00 2001 From: Takashi Iwai <tiwai@xxxxxxx> Date: Mon, 9 Oct 2017 14:26:27 +0200 Subject: ALSA: line6: Fix NULL dereference at podhd_disconnect() From: Takashi Iwai <tiwai@xxxxxxx> commit 54a4b2b45817ea2365b40c923c098a26af0c0dbb upstream. When podhd_init() failed with the acquiring a ctrl i/f, the line6 helper still calls the disconnect callback that eventually calls again usb_driver_release_interface() with the NULL intf. Put the proper NULL check before calling it for avoiding an Oops. Fixes: fc90172ba283 ("ALSA: line6: Claim pod x3 usb data interface") Reported-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Tested-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Signed-off-by: Takashi Iwai <tiwai@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- sound/usb/line6/podhd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/sound/usb/line6/podhd.c +++ b/sound/usb/line6/podhd.c @@ -301,7 +301,8 @@ static void podhd_disconnect(struct usb_ intf = usb_ifnum_to_if(line6->usbdev, pod->line6.properties->ctrl_if); - usb_driver_release_interface(&podhd_driver, intf); + if (intf) + usb_driver_release_interface(&podhd_driver, intf); } } Patches currently in stable-queue which might be from tiwai@xxxxxxx are queue-4.13/alsa-line6-fix-null-dereference-at-podhd_disconnect.patch queue-4.13/alsa-line6-fix-missing-initialization-before-error-path.patch queue-4.13/alsa-caiaq-fix-stray-urb-at-probe-error-path.patch queue-4.13/alsa-seq-fix-copy_from_user-call-inside-lock.patch queue-4.13/alsa-seq-fix-use-after-free-at-creating-a-port.patch queue-4.13/alsa-line6-fix-leftover-urb-at-error-path-during-probe.patch queue-4.13/alsa-usb-audio-kill-stray-urb-at-exiting.patch