linux-kernel - [PATCH] ALSA: usb-audio: Fix incorrect NULL check in create_yamaha_midi

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Date:   Wed, 13 Nov 2019 12:12:59 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     alsa-devel@...a-project.org
Cc:     Pavel Machek <pavel@...x.de>, linux-kernel@...r.kernel.org
Subject: [PATCH] ALSA: usb-audio: Fix incorrect NULL check in create_yamaha_midi_quirk()

The commit 60849562a5db ("ALSA: usb-audio: Fix possible NULL
dereference at create_yamaha_midi_quirk()") added NULL checks in
create_yamaha_midi_quirk(), but there was an overlook.  The code
allows one of either injd or outjd is NULL, but the second if check
made returning -ENODEV if any of them is NULL.  Fix it in a proper
form.

Fixes: 60849562a5db ("ALSA: usb-audio: Fix possible NULL dereference at create_yamaha_midi_quirk()")
Reported-by: Pavel Machek <pavel@...x.de>
Cc: <stable@...r.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 sound/usb/quirks.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 0bbe1201a6ac..349e1e52996d 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -248,8 +248,8 @@ static int create_yamaha_midi_quirk(struct snd_usb_audio *chip,
 					NULL, USB_MS_MIDI_OUT_JACK);
 	if (!injd && !outjd)
 		return -ENODEV;
-	if (!(injd && snd_usb_validate_midi_desc(injd)) ||
-	    !(outjd && snd_usb_validate_midi_desc(outjd)))
+	if ((injd && !snd_usb_validate_midi_desc(injd)) ||
+	    (outjd && !snd_usb_validate_midi_desc(outjd)))
 		return -ENODEV;
 	if (injd && (injd->bLength < 5 ||
 		     (injd->bJackType != USB_MS_EMBEDDED &&
-- 
2.16.4