linux-kernel - [PATCH 4.19 012/422] ALSA: usb-audio: Fix incorrect NULL check in create_yamaha_midi

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Message-Id: <20191119051400.964197147@linuxfoundation.org>
Date:   Tue, 19 Nov 2019 06:13:29 +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, Pavel Machek <pavel@...x.de>,
        Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 4.19 012/422] ALSA: usb-audio: Fix incorrect NULL check in create_yamaha_midi_quirk()

From: Takashi Iwai <tiwai@...e.de>

commit cc9dbfa9707868fb0ca864c05e0c42d3f4d15cf2 upstream.

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>
Link: https://lore.kernel.org/r/20191113111259.24123-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/usb/quirks.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -259,8 +259,8 @@ static int create_yamaha_midi_quirk(stru
 					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 &&