Patch "ALSA: seq: Fix missing NULL check at remove_events ioctl" has been added to the 3.14-stable tree

Patch "ALSA: seq: Fix missing NULL check at remove_events ioctl" has been added to the 3.14-stable tree

[gregkh]

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

    ALSA: seq: Fix missing NULL check at remove_events ioctl

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-seq-fix-missing-null-check-at-remove_events-ioctl.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 030e2c78d3a91dd0d27fef37e91950dde333eba1 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Tue, 12 Jan 2016 12:38:02 +0100
Subject: ALSA: seq: Fix missing NULL check at remove_events ioctl

From: Takashi Iwai <tiwai@suse.de>

commit 030e2c78d3a91dd0d27fef37e91950dde333eba1 upstream.

snd_seq_ioctl_remove_events() calls snd_seq_fifo_clear()
unconditionally even if there is no FIFO assigned, and this leads to
an Oops due to NULL dereference.  The fix is just to add a proper NULL
check.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Tested-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/seq/seq_clientmgr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -1950,7 +1950,7 @@ static int snd_seq_ioctl_remove_events(s
 		 * No restrictions so for a user client we can clear
 		 * the whole fifo
 		 */
-		if (client->type == USER_CLIENT)
+		if (client->type == USER_CLIENT && client->data.user.fifo)
 			snd_seq_fifo_clear(client->data.user.fifo);
 	}
 


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