linux-kernel - [PATCH 4.4 021/105] ALSA: usb-audio: Add check return value for usb

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Message-Id: <20171215092307.002611698@linuxfoundation.org>
Date:   Fri, 15 Dec 2017 10:44:19 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jaejoong Kim <climbbb.kim@...il.com>,
        Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 4.4 021/105] ALSA: usb-audio: Add check return value for usb_string()

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jaejoong Kim <climbbb.kim@...il.com>

commit 89b89d121ffcf8d9546633b98ded9d18b8f75891 upstream.

snd_usb_copy_string_desc() returns zero if usb_string() fails.
In case of failure, we need to check the snd_usb_copy_string_desc()'s
return value and add an exception case

Signed-off-by: Jaejoong Kim <climbbb.kim@...il.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/usb/mixer.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -2106,13 +2106,14 @@ static int parse_audio_selector_unit(str
 	if (len)
 		;
 	else if (nameid)
-		snd_usb_copy_string_desc(state, nameid, kctl->id.name,
+		len = snd_usb_copy_string_desc(state, nameid, kctl->id.name,
 					 sizeof(kctl->id.name));
-	else {
+	else
 		len = get_term_name(state, &state->oterm,
 				    kctl->id.name, sizeof(kctl->id.name), 0);
-		if (!len)
-			strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
+
+	if (!len) {
+		strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
 
 		if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
 			append_ctl_name(kctl, " Clock Source");