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ALSA: usb-audio: Fix copy&paste error in the validator

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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: 57f8770620 ("ALSA: usb-audio: More validations of descriptor units")
Reported-by: syzbot+0620f79a1978b1133fd7@syzkaller.appspotmail.com
Link: https://lore.kernel.org/r/s5hsgnkdbsl.wl-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2019-10-22 17:45:14 +02:00
parent c8d2dcb3e9
commit ba8bf0967a
1 changed files with 1 additions and 1 deletions
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sound/usb/validate.c
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@ -75,7 +75,7 @@ static bool validate_processing_unit(const void *p,
if (d->bLength < sizeof(*d)) if (d->bLength < sizeof(*d))
return false; return false;
len = d->bLength < sizeof(*d) + d->bNrInPins; len = sizeof(*d) + d->bNrInPins;
if (d->bLength < len) if (d->bLength < len)
return false; return false;
switch (v->protocol) { switch (v->protocol) {