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ALSA: usb-audio: fix set_format altsetting sanity check

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Make sure to check the return value of usb_altnum_to_altsetting() to
avoid dereferencing a NULL pointer when the requested alternate settings
is missing.

The format altsetting number may come from a quirk table and there does
not seem to be any other validation of it (the corresponding index is
checked however).

Fixes: b099b9693d ("ALSA: usb-audio: Avoid superfluous usb_set_interface() calls")
Cc: stable <stable@vger.kernel.org>     # 4.18
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20191220093134.1248-1-johan@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Johan Hovold 2019-12-20 10:31:34 +01:00 committed by Takashi Iwai
parent 66c5d718e5
commit 0141254b0a
1 changed files with 2 additions and 2 deletions
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4
sound/usb/pcm.c
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@ -506,9 +506,9 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
if (WARN_ON(!iface))
return -EINVAL;
alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
altsd = get_iface_desc(alts);
if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
if (WARN_ON(!alts))
return -EINVAL;
altsd = get_iface_desc(alts);
if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
return 0;