From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753897AbdFEQbe (ORCPT ); Mon, 5 Jun 2017 12:31:34 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:60594 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753841AbdFEQb3 (ORCPT ); Mon, 5 Jun 2017 12:31:29 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Takashi Iwai Subject: [PATCH 4.11 077/115] Revert "ALSA: usb-audio: purge needless variable length array" Date: Mon, 5 Jun 2017 18:17:50 +0200 Message-Id: <20170605153100.455422768@linuxfoundation.org> X-Mailer: git-send-email 2.13.0 In-Reply-To: <20170605153056.650217313@linuxfoundation.org> References: <20170605153056.650217313@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: Takashi Iwai commit 64188cfbe5245d412de2139a3864e4e00b4136f0 upstream. 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 Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/usb/mixer_us16x08.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/sound/usb/mixer_us16x08.c +++ b/sound/usb/mixer_us16x08.c @@ -698,12 +698,12 @@ static int snd_us16x08_meter_get(struct 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 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;