From 6cd17ea70b26f66651c7afc123245e379dd14450 Mon Sep 17 00:00:00 2001
From: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Date: Fri, 18 May 2018 01:08:59 +0300
Subject: [PATCH] ALSA: usb: stream: fix potential memory leak during uac3 interface parsing
Git-commit: 6cd17ea70b26f66651c7afc123245e379dd14450
Patch-mainline: v4.18-rc1
References: bsc#1121278

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

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

---
 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 bce315240955..d16e1c23f4e9 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -982,13 +982,16 @@ snd_usb_get_audioformat_uac3(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 @@ snd_usb_get_audioformat_uac3(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;
-- 
2.20.1