linux-kernel - [PATCH] ALSA: usb: stream: fix potential memory leak during uac3 interface parsing

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Message-Id: <1526594939-21084-1-git-send-email-ruslan.bilovol@gmail.com>
Date:   Fri, 18 May 2018 01:08:59 +0300
From:   Ruslan Bilovol <ruslan.bilovol@...il.com>
To:     Takashi Iwai <tiwai@...e.com>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ALSA: usb: stream: fix potential memory leak during uac3 interface parsing

UAC3 channel map is created during interface parsing,
and in some cases was not freed in failure paths.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@...il.com>
---
 sound/usb/stream.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index bce3152..d16e1c2 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -982,13 +982,16 @@ static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
 
 	dev_err(&dev->dev, "%u:%d : bogus bTerminalLink %d\n",
 			iface_no, altno, as->bTerminalLink);
+	kfree(chmap);
 	return NULL;
 
 found_clock:
 	fp = audio_format_alloc_init(chip, alts, UAC_VERSION_3, iface_no,
 				     altset_idx, altno, num_channels, clock);
-	if (!fp)
+	if (!fp) {
+		kfree(chmap);
 		return ERR_PTR(-ENOMEM);
+	}
 
 	fp->chmap = chmap;
 
@@ -1009,6 +1012,7 @@ static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
 							       iface_no);
 		/* ok, let's parse further... */
 		if (snd_usb_parse_audio_format_v3(chip, fp, as, stream) < 0) {
+			kfree(fp->chmap);
 			kfree(fp->rate_table);
 			kfree(fp);
 			return NULL;
-- 
1.9.1