From a820ccbe21e8ce8e86c39cd1d3bc8c7d1cbb949b Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Mon, 2 Apr 2018 22:41:43 +0200
Subject: [PATCH] ALSA: pcm: Fix UAF at PCM release via PCM timer access
Git-commit: a820ccbe21e8ce8e86c39cd1d3bc8c7d1cbb949b
Patch-mainline: v4.17-rc1
References: bsc#1051510

The PCM runtime object is created and freed dynamically at PCM stream
open / close time.  This is tracked via substream->runtime, and it's
cleared at snd_pcm_detach_substream().

The runtime object assignment is protected by PCM open_mutex, so for
all PCM operations, it's safely handled.  However, each PCM substream
provides also an ALSA timer interface, and user-space can access to
this while closing a PCM substream.  This may eventually lead to a
UAF, as snd_pcm_timer_resolution() tries to access the runtime while
clearing it in other side.

Fortunately, it's the only concurrent access from the PCM timer, and
it merely reads runtime->timer_resolution field.  So, we can avoid the
race by reordering kfree() and wrapping the substream->runtime
clearance with the corresponding timer lock.

Reported-by: syzbot+8e62ff4e07aa2ce87826@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

---
 sound/core/pcm.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -28,6 +28,7 @@
 #include <sound/core.h>
 #include <sound/minors.h>
 #include <sound/pcm.h>
+#include <sound/timer.h>
 #include <sound/control.h>
 #include <sound/info.h>
 
@@ -1025,8 +1026,13 @@ void snd_pcm_detach_substream(struct snd
 	snd_free_pages((void*)runtime->control,
 		       PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 	kfree(runtime->hw_constraints.rules);
-	kfree(runtime);
+	/* Avoid concurrent access to runtime via PCM timer interface */
+	if (substream->timer)
+		spin_lock_irq(&substream->timer->lock);
 	substream->runtime = NULL;
+	if (substream->timer)
+		spin_unlock_irq(&substream->timer->lock);
+	kfree(runtime);
 	put_pid(substream->pid);
 	substream->pid = NULL;
 	substream->pstr->substream_opened--;