From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DDE24C04A68 for ; Wed, 27 Jul 2022 16:25:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235948AbiG0QZC (ORCPT ); Wed, 27 Jul 2022 12:25:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49950 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235390AbiG0QX6 (ORCPT ); Wed, 27 Jul 2022 12:23:58 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 18C184D155; Wed, 27 Jul 2022 09:23:07 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 37607619D0; Wed, 27 Jul 2022 16:22:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3EF3EC43470; Wed, 27 Jul 2022 16:22:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1658938977; bh=3iCMFHDjs1WQc6tiSgGz2iqgwppC7LL8WG2EUZz6tfg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GU86tkKkFz4n4347T9qqkEyInBhJnW7Ubb4SlxuWK1H9gaXXHgb5k6wu53xw87wU+ PTL6us4EtEpkRDB2rX8h5Clg3KWhRceo4TSNX6mvg+3wlCIokn2IYBMdPN6jtN9X/c nf/EqTOp5B3NNsxoJUEd3NmH6lSJtBmIirLLJaGc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lars-Peter Clausen , Takashi Iwai Subject: [PATCH 4.9 20/26] ALSA: memalloc: Align buffer allocations in page size Date: Wed, 27 Jul 2022 18:10:49 +0200 Message-Id: <20220727160959.929028820@linuxfoundation.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220727160959.122591422@linuxfoundation.org> References: <20220727160959.122591422@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Takashi Iwai commit 5c1733e33c888a3cb7f576564d8ad543d5ad4a9e upstream. Currently the standard memory allocator (snd_dma_malloc_pages*()) passes the byte size to allocate as is. Most of the backends allocates real pages, hence the actual allocations are aligned in page size. However, the genalloc doesn't seem assuring the size alignment, hence it may result in the access outside the buffer when the whole memory pages are exposed via mmap. For avoiding such inconsistencies, this patch makes the allocation size always to be aligned in page size. Note that, after this change, snd_dma_buffer.bytes field contains the aligned size, not the originally requested size. This value is also used for releasing the pages in return. Reviewed-by: Lars-Peter Clausen Link: https://lore.kernel.org/r/20201218145625.2045-2-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/core/memalloc.c | 1 + 1 file changed, 1 insertion(+) --- a/sound/core/memalloc.c +++ b/sound/core/memalloc.c @@ -177,6 +177,7 @@ int snd_dma_alloc_pages(int type, struct if (WARN_ON(!dmab)) return -ENXIO; + size = PAGE_ALIGN(size); dmab->dev.type = type; dmab->dev.dev = device; dmab->bytes = 0;