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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Wenwen Wang <wenwen@cs.uga.edu>,
        Takashi Iwai <tiwai@suse.de>
Subject: [PATCH 4.19 72/91] ALSA: usb-audio: fix a memory leak bug
Date:   Wed, 14 Aug 2019 19:01:35 +0200
Message-Id: <20190814165752.743785887@linuxfoundation.org>
In-Reply-To: <20190814165748.991235624@linuxfoundation.org>
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From: Wenwen Wang <wenwen@cs.uga.edu>

commit a67060201b746a308b1674f66bf289c9faef6d09 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 sound/usb/stream.c |    1 +
 1 file changed, 1 insertion(+)

--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -1053,6 +1053,7 @@ found_clock:
 
 		pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 		if (!pd) {
+			kfree(fp->chmap);
 			kfree(fp->rate_table);
 			kfree(fp);
 			return NULL;