diff options
| author | Johan Hovold <johan@kernel.org> | 2019-12-20 12:31:34 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-09 12:18:59 +0300 |
| commit | 70986b20f631c497414a4a840b818d61ff70fc8e (patch) | |
| tree | e6ef5bc4796d617f3e4777f65d84a4620ce49933 /sound/usb/pcm.c | |
| parent | fb6b15324d2ff8910c096424f1b78e709e542c63 (diff) | |
| download | linux-70986b20f631c497414a4a840b818d61ff70fc8e.tar.xz | |
ALSA: usb-audio: fix set_format altsetting sanity check
commit 0141254b0a74b37aa7eb13d42a56adba84d51c73 upstream.
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: b099b9693d23 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/usb/pcm.c')
| -rw-r--r-- | sound/usb/pcm.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index 1828225ba882..c022c3ee227a 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -513,9 +513,9 @@ 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) return 0; |