[PATCH 4.19 72/91] ALSA: usb-audio: fix a memory leak bug

[Greg Kroah-Hartman]

From: Wenwen Wang <wen...@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 <wen...@cs.uga.edu>
Cc: <sta...@vger.kernel.org>
Signed-off-by: Takashi Iwai <ti...@suse.de>
Signed-off-by: Greg Kroah-Hartman <gre...@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;