Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965248AbaGCJ3p (ORCPT ); Thu, 3 Jul 2014 05:29:45 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:52615 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758738AbaGCJZK (ORCPT ); Thu, 3 Jul 2014 05:25:10 -0400 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Lars-Peter Clausen , Takashi Iwai , Luis Henriques Subject: [PATCH 3.11 183/198] ALSA: control: Make sure that id->index does not overflow Date: Thu, 3 Jul 2014 10:20:26 +0100 Message-Id: <1404379241-8590-184-git-send-email-luis.henriques@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1404379241-8590-1-git-send-email-luis.henriques@canonical.com> References: <1404379241-8590-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.11 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.11.10.13 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Lars-Peter Clausen commit 883a1d49f0d77d30012f114b2e19fc141beb3e8e upstream. The ALSA control code expects that the range of assigned indices to a control is continuous and does not overflow. Currently there are no checks to enforce this. If a control with a overflowing index range is created that control becomes effectively inaccessible and unremovable since snd_ctl_find_id() will not be able to find it. This patch adds a check that makes sure that controls with a overflowing index range can not be created. Signed-off-by: Lars-Peter Clausen Acked-by: Jaroslav Kysela Signed-off-by: Takashi Iwai Signed-off-by: Luis Henriques --- sound/core/control.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/sound/core/control.c b/sound/core/control.c index 93215b4bec6b..98a29b26c5f4 100644 --- a/sound/core/control.c +++ b/sound/core/control.c @@ -343,6 +343,9 @@ int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) if (snd_BUG_ON(!card || !kcontrol->info)) goto error; id = kcontrol->id; + if (id.index > UINT_MAX - kcontrol->count) + goto error; + down_write(&card->controls_rwsem); if (snd_ctl_find_id(card, &id)) { up_write(&card->controls_rwsem); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/