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authorTakashi Iwai <tiwai@suse.de>2017-05-30 09:23:41 +0200
committerTakashi Iwai <tiwai@suse.de>2017-05-31 08:46:14 +0200
commit64188cfbe5245d412de2139a3864e4e00b4136f0 (patch)
tree7551a8af8eb7594e467e6051e96ffdb81b9f02a2 /sound
parent1fc2e41f7af4572b07190f9dec28396b418e9a36 (diff)
Revert "ALSA: usb-audio: purge needless variable length array"
This reverts commit 89b593c30e83 ("ALSA: usb-audio: purge needless variable length array"). The patch turned out to cause a severe regression, triggering an Oops at snd_usb_ctl_msg(). It was overseen that snd_usb_ctl_msg() writes back the response to the given buffer, while the patch changed it to a read-only const buffer. (One should always double-check when an extra pointer cast is present...) As a simple fix, just revert the affected commit. It was merely a cleanup. Although it brings VLA again, it's clearer as a fix. We'll address the VLA later in another patch. Fixes: 89b593c30e83 ("ALSA: usb-audio: purge needless variable length array") Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=195875 Cc: <stable@vger.kernel.org> # v4.11+ Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/usb/mixer_us16x08.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/sound/usb/mixer_us16x08.c b/sound/usb/mixer_us16x08.c
index dc48eedea92e..29d2c9282987 100644
--- a/sound/usb/mixer_us16x08.c
+++ b/sound/usb/mixer_us16x08.c
@@ -698,12 +698,12 @@ static int snd_us16x08_meter_get(struct snd_kcontrol *kcontrol,
struct snd_usb_audio *chip = elem->head.mixer->chip;
struct snd_us16x08_meter_store *store = elem->private_data;
u8 meter_urb[64];
- char tmp[sizeof(mix_init_msg2)] = {0};
+ char tmp[max(sizeof(mix_init_msg1), sizeof(mix_init_msg2))];
switch (kcontrol->private_value) {
case 0:
- snd_us16x08_send_urb(chip, (char *)mix_init_msg1,
- sizeof(mix_init_msg1));
+ memcpy(tmp, mix_init_msg1, sizeof(mix_init_msg1));
+ snd_us16x08_send_urb(chip, tmp, 4);
snd_us16x08_recv_urb(chip, meter_urb,
sizeof(meter_urb));
kcontrol->private_value++;
@@ -721,7 +721,7 @@ static int snd_us16x08_meter_get(struct snd_kcontrol *kcontrol,
case 3:
memcpy(tmp, mix_init_msg2, sizeof(mix_init_msg2));
tmp[2] = snd_get_meter_comp_index(store);
- snd_us16x08_send_urb(chip, tmp, sizeof(mix_init_msg2));
+ snd_us16x08_send_urb(chip, tmp, 10);
snd_us16x08_recv_urb(chip, meter_urb,
sizeof(meter_urb));
kcontrol->private_value = 0;

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