From: Wenwen Wang <wenwen@cs.uga.edu>
Date: Tue, 6 Aug 2019 07:00:27 +0000 (-0400)
Subject: ALSA: usb-audio: fix a memory leak bug
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a67060201b746a308b1674f66bf289c9faef6d09;p=linux.git

ALSA: usb-audio: fix a memory leak bug

In snd_usb_get_audioformat_uac3(), a structure for channel maps 'chmap' is
allocated through kzalloc() before the execution goto 'found_clock'.
However, this structure is not deallocated if the memory allocation for
'pd' fails, leading to a memory leak bug.

To fix the above issue, free 'fp->chmap' before returning NULL.

Fixes: 7edf3b5e6a45 ("ALSA: usb-audio: AudioStreaming Power Domain parsing")
Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index 7ee9d17d0143a..e852c7fd61097 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -1043,6 +1043,7 @@ found_clock:
 
 		pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 		if (!pd) {
+			kfree(fp->chmap);
 			kfree(fp->rate_table);
 			kfree(fp);
 			return NULL;