linux-kernel - [PATCH] ALSA: usb-audio: fix a memory leak bug

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Date:   Tue, 6 Aug 2019 03:00:27 -0400
From:   Wenwen Wang <wenwen@...uga.edu>
To:     Wenwen Wang <wenwen@...uga.edu>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Shuah Khan <shuah@...nel.org>,
        Richard Fontana <rfontana@...hat.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Thomas Gleixner <tglx@...utronix.de>,
        "moderated list:SOUND" <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH] 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.

Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
---
 sound/usb/stream.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index 7ee9d17..e852c7f 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -1043,6 +1043,7 @@ snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,

                pd = kzalloc(sizeof(*pd), GFP_KERNEL);
                if (!pd) {
+                       kfree(fp->chmap);
                        kfree(fp->rate_table);
                        kfree(fp);
                        return NULL;
--
2.7.4