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| author | Takashi Iwai <tiwai@suse.de> | 2019-08-15 11:41:06 +0200 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2020-06-29 20:08:05 -0400 |
| commit | d9ed57ecc2947abcf5a8226b34e0634a8fe77692 (patch) | |
| tree | 3f86710367b79d0f6f485b9e5e9657b7baee1487 | |
| parent | 7f9d01a3dac7a5b9ef2b80d1c7049c25743cd661 (diff) | |
| download | linux-stable-d9ed57ecc2947abcf5a8226b34e0634a8fe77692.tar.gz | |
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>
| -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 198515f86fcc..9646513f4b4a 100644 --- a/sound/usb/mixer_quirks.c +++ b/sound/usb/mixer_quirks.c @@ -1168,17 +1168,17 @@ 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; } } |