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 8BE56C433FE for ; Mon, 24 Jan 2022 19:23:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349977AbiAXTW7 (ORCPT ); Mon, 24 Jan 2022 14:22:59 -0500 Received: from dfw.source.kernel.org ([139.178.84.217]:42282 "EHLO dfw.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346371AbiAXTMl (ORCPT ); Mon, 24 Jan 2022 14:12:41 -0500 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 04975611DA; Mon, 24 Jan 2022 19:12:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DF88DC340E7; Mon, 24 Jan 2022 19:12:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1643051558; bh=an8wbRIoUSTqX7geJnMl5kKqR7w6jg1m7eh6WjdnOt4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=J9rtlf9f5EZNvqpC7xK99ydPyWUKwupqVSoyyTB3mYNjCkD/ObaHn06ia7fPeOQ5o XX6p3w7afWuJ8NflCO1dMpL+q6nbIDo95q2O9HuciNzdcd2hOUANHE5FcZCdTDQuhh SUouzQR8Cp5veKi5CSciS4hg+ELljzGwCmRhcplg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christophe JAILLET , Mike Marshall Subject: [PATCH 4.19 014/239] orangefs: Fix the size of a memory allocation in orangefs_bufmap_alloc() Date: Mon, 24 Jan 2022 19:40:52 +0100 Message-Id: <20220124183943.568589736@linuxfoundation.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220124183943.102762895@linuxfoundation.org> References: <20220124183943.102762895@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: Christophe JAILLET commit 40a74870b2d1d3d44e13b3b73c6571dd34f5614d upstream. 'buffer_index_array' really looks like a bitmap. So it should be allocated as such. When kzalloc is called, a number of bytes is expected, but a number of longs is passed instead. In get(), if not enough memory is allocated, un-allocated memory may be read or written. So use bitmap_zalloc() to safely allocate the correct memory size and avoid un-expected behavior. While at it, change the corresponding kfree() into bitmap_free() to keep the semantic. Fixes: ea2c9c9f6574 ("orangefs: bufmap rewrite") Signed-off-by: Christophe JAILLET Signed-off-by: Mike Marshall Signed-off-by: Greg Kroah-Hartman --- fs/orangefs/orangefs-bufmap.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) --- a/fs/orangefs/orangefs-bufmap.c +++ b/fs/orangefs/orangefs-bufmap.c @@ -179,7 +179,7 @@ orangefs_bufmap_free(struct orangefs_buf { kfree(bufmap->page_array); kfree(bufmap->desc_array); - kfree(bufmap->buffer_index_array); + bitmap_free(bufmap->buffer_index_array); kfree(bufmap); } @@ -229,8 +229,7 @@ orangefs_bufmap_alloc(struct ORANGEFS_de bufmap->desc_size = user_desc->size; bufmap->desc_shift = ilog2(bufmap->desc_size); - bufmap->buffer_index_array = - kzalloc(DIV_ROUND_UP(bufmap->desc_count, BITS_PER_LONG), GFP_KERNEL); + bufmap->buffer_index_array = bitmap_zalloc(bufmap->desc_count, GFP_KERNEL); if (!bufmap->buffer_index_array) goto out_free_bufmap; @@ -253,7 +252,7 @@ orangefs_bufmap_alloc(struct ORANGEFS_de out_free_desc_array: kfree(bufmap->desc_array); out_free_index_array: - kfree(bufmap->buffer_index_array); + bitmap_free(bufmap->buffer_index_array); out_free_bufmap: kfree(bufmap); out: