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author | Takashi Iwai <tiwai@suse.de> | 2019-08-15 11:41:06 +0200 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-06 10:22:10 +0200 |
commit | b5d1f31d97afc06b340cd5a04a5dd6693c0a0052 (patch) | |
tree | 8bb2aa097cbabd2b4dc5375ef214353e21b78c75 /sound | |
parent | 98a2017c4a17fea2f935d2463c852294d1bfbb5d (diff) | |
download | linux-stable-b5d1f31d97afc06b340cd5a04a5dd6693c0a0052.tar.gz linux-stable-b5d1f31d97afc06b340cd5a04a5dd6693c0a0052.tar.bz2 linux-stable-b5d1f31d97afc06b340cd5a04a5dd6693c0a0052.zip |
ALSA: usb-audio: Fix invalid NULL check in snd_emuusb_set_samplerate()
commit 6de3c9e3f6b3eaf66859e1379b3f35dda781416b upstream.
The quirk function snd_emuusb_set_samplerate() has a NULL check for
the mixer element, but this is useless in the current code. It used
to be a check against mixer->id_elems[unitid] but it was changed later
to the value after mixer_eleme_list_to_info() which is always non-NULL
due to the container_of() usage.
This patch fixes the check before the conversion.
While we're at it, correct a typo in the comment in the function,
too.
Fixes: 8c558076c740 ("ALSA: usb-audio: Clean up mixer element list traverse")
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound')
-rw-r--r-- | sound/usb/mixer_quirks.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c index 5b342fe30c75..10c6971cf477 100644 --- a/sound/usb/mixer_quirks.c +++ b/sound/usb/mixer_quirks.c @@ -1167,17 +1167,17 @@ void snd_emuusb_set_samplerate(struct snd_usb_audio *chip, { struct usb_mixer_interface *mixer; struct usb_mixer_elem_info *cval; - int unitid = 12; /* SamleRate ExtensionUnit ID */ + int unitid = 12; /* SampleRate ExtensionUnit ID */ list_for_each_entry(mixer, &chip->mixer_list, list) { - cval = mixer_elem_list_to_info(mixer->id_elems[unitid]); - if (cval) { + if (mixer->id_elems[unitid]) { + cval = mixer_elem_list_to_info(mixer->id_elems[unitid]); snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, cval->control << 8, samplerate_id); snd_usb_mixer_notify_id(mixer, unitid); + break; } - break; } } |