[PATCH 4.19 064/125] ALSA: usb-audio: Fix copy&paste error in the validator

[Greg Kroah-Hartman]

From: Takashi Iwai <tiwai@xxxxxxx>

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@xxxxxxxxxxxxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/s5hsgnkdbsl.wl-tiwai@xxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 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) {