Patch "ALSA: control: Avoid kernel warnings from tlv ioctl with numid 0" has been added to the 3.14-stable tree

[<gregkh@linuxfoundation.org>]

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

    ALSA: control: Avoid kernel warnings from tlv ioctl with numid 0

to the 3.14-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-control-avoid-kernel-warnings-from-tlv-ioctl-with-numid-0.patch
and it can be found in the queue-3.14 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 c0bcdbdff3ff73a54161fca3cb8b6cdbd0bb8762 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Mon, 18 Jan 2016 14:12:40 +0100
Subject: ALSA: control: Avoid kernel warnings from tlv ioctl with numid 0

From: Takashi Iwai <tiwai@suse.de>

commit c0bcdbdff3ff73a54161fca3cb8b6cdbd0bb8762 upstream.

When a TLV ioctl with numid zero is handled, the driver may spew a
kernel warning with a stack trace at each call.  The check was
intended obviously only for a kernel driver, but not for a user
interaction.  Let's fix it.

This was spotted by syzkaller fuzzer.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 sound/core/control.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -1325,6 +1325,8 @@ static int snd_ctl_tlv_ioctl(struct snd_
 		return -EFAULT;
 	if (tlv.length < sizeof(unsigned int) * 2)
 		return -EINVAL;
+	if (!tlv.numid)
+		return -EINVAL;
 	down_read(&card->controls_rwsem);
 	kctl = snd_ctl_find_numid(card, tlv.numid);
 	if (kctl == NULL) {


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

queue-3.14/alsa-hrtimer-fix-stall-by-hrtimer_cancel.patch
queue-3.14/alsa-timer-harden-slave-timer-list-handling.patch
queue-3.14/alsa-timer-fix-double-unlink-of-active_list.patch
queue-3.14/alsa-control-avoid-kernel-warnings-from-tlv-ioctl-with-numid-0.patch
queue-3.14/alsa-hda-realtek-fix-silent-headphone-output-on-macpro-4-1-v2.patch
queue-3.14/alsa-rme96-fix-unexpected-volume-reset-after-rate-changes.patch
queue-3.14/alsa-hda-set-skl-hda-controller-power-at-freeze-and-thaw.patch
queue-3.14/alsa-hda-add-inverted-dmic-for-packard-bell-dots.patch
queue-3.14/alsa-hda-add-intel-lewisburg-device-ids-audio.patch
queue-3.14/alsa-seq-fix-race-at-timer-setup-and-close.patch
queue-3.14/alsa-pcm-fix-snd_pcm_hw_params-struct-copy-in-compat-mode.patch
queue-3.14/alsa-seq-fix-snd_seq_call_port_info_ioctl-in-compat-mode.patch
queue-3.14/alsa-seq-fix-missing-null-check-at-remove_events-ioctl.patch
queue-3.14/alsa-timer-fix-race-among-timer-ioctls.patch
queue-3.14/alsa-hda-apply-pin-fixup-for-hp-probook-6550b.patch