linux-kernel - [PATCH 5.3 089/193] ALSA: usb-audio: Fix copy&paste error in the validator

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Date:   Mon, 11 Nov 2019 19:27:51 +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,
        syzbot+0620f79a1978b1133fd7@...kaller.appspotmail.com,
        Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 5.3 089/193] ALSA: usb-audio: Fix copy&paste error in the validator

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

commit ba8bf0967a154796be15c4983603aad0b05c3138 upstream.

The recently introduced USB-audio descriptor validator had a stupid
copy&paste error that may lead to an unexpected overlook of too short
descriptors for processing and extension units.  It's likely the cause
of the report triggered by syzkaller fuzzer.  Let's fix it.

Fixes: 57f8770620e9 ("ALSA: usb-audio: More validations of descriptor units")
Reported-by: syzbot+0620f79a1978b1133fd7@...kaller.appspotmail.com
Link: https://lore.kernel.org/r/s5hsgnkdbsl.wl-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/usb/validate.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/usb/validate.c
+++ b/sound/usb/validate.c
@@ -75,7 +75,7 @@ static bool validate_processing_unit(con
 
 	if (d->bLength < sizeof(*d))
 		return false;
-	len = d->bLength < sizeof(*d) + d->bNrInPins;
+	len = sizeof(*d) + d->bNrInPins;
 	if (d->bLength < len)
 		return false;
 	switch (v->protocol) {