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ALSA: usb-audio: Fix possible NULL dereference at create_yamaha_midi_quirk()

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The previous addition of descriptor validation may lead to a NULL
dereference at create_yamaha_midi_quirk() when either injd or outjd is
NULL.  Add proper non-NULL checks.

Fixes: 57f8770620 ("ALSA: usb-audio: More validations of descriptor units")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2019-08-26 13:55:21 +02:00
parent e0ccdef926
commit 60849562a5
1 changed files with 2 additions and 2 deletions
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4
sound/usb/quirks.c
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@ -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 (!snd_usb_validate_midi_desc(injd) ||
!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 &&