From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3327E2554C; Tue, 16 Jan 2024 01:07:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OE93sY8L" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1D187C43390; Tue, 16 Jan 2024 01:07:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1705367228; bh=TVsesXNPIVdcp8KE2XG7OSiBzktny+loH17E2w0ilw8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OE93sY8LyKb2lxgbomoThHPC97XcLlmS9Cnrkw8K9WRe75ZQD3QvfS4ipKGtQ/EyQ 5xlI4r8P+qArdx2xYTxjRAwEWUvYJGAoGv6ubyS4GR8aVNPbO+zMfsJ59uH8Xh2nqn 5khSvMxzwk7QEXo5do0FcziKz26FPWcjeLWd6P5meS3S3hS3wG7fkQ8OinoZZfe0/V EGvm/d0MFjpDVBoKq/vJ7g7O/oQiWr2ddd9/IaJU3nGq94iYkQIp5QgO0D7OEqxq4l QdGGur1uBi2ColmqGHdB0ylJKmMjPiMp8DsM8lKaClBYFWxvW8pClgNYtyH3yU0SdY QxbL6qXIcJ/4Q== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Baokun Li , Jan Kara , Theodore Ts'o , Sasha Levin , adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org Subject: [PATCH AUTOSEL 6.1 12/14] ext4: unify the type of flexbg_size to unsigned int Date: Mon, 15 Jan 2024 20:06:14 -0500 Message-ID: <20240116010642.218876-12-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240116010642.218876-1-sashal@kernel.org> References: <20240116010642.218876-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.73 Content-Transfer-Encoding: 8bit From: Baokun Li [ Upstream commit 658a52344fb139f9531e7543a6e0015b630feb38 ] The maximum value of flexbg_size is 2^31, but the maximum value of int is (2^31 - 1), so overflow may occur when the type of flexbg_size is declared as int. For example, when uninit_mask is initialized in ext4_alloc_group_tables(), if flexbg_size == 2^31, the initialized uninit_mask is incorrect, and this may causes set_flexbg_block_bitmap() to trigger a BUG_ON(). Therefore, the flexbg_size type is declared as unsigned int to avoid overflow and memory waste. Signed-off-by: Baokun Li Reviewed-by: Jan Kara Link: https://lore.kernel.org/r/20231023013057.2117948-2-libaokun1@huawei.com Signed-off-by: Theodore Ts'o Signed-off-by: Sasha Levin --- fs/ext4/resize.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 9833ab6db117..31f5da7f9f6c 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -241,7 +241,7 @@ struct ext4_new_flex_group_data { * * Returns NULL on failure otherwise address of the allocated structure. */ -static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) +static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned int flexbg_size) { struct ext4_new_flex_group_data *flex_gd; @@ -296,7 +296,7 @@ static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) */ static int ext4_alloc_group_tables(struct super_block *sb, struct ext4_new_flex_group_data *flex_gd, - int flexbg_size) + unsigned int flexbg_size) { struct ext4_new_group_data *group_data = flex_gd->groups; ext4_fsblk_t start_blk; @@ -397,12 +397,12 @@ static int ext4_alloc_group_tables(struct super_block *sb, group = group_data[0].group; printk(KERN_DEBUG "EXT4-fs: adding a flex group with " - "%d groups, flexbg size is %d:\n", flex_gd->count, + "%u groups, flexbg size is %u:\n", flex_gd->count, flexbg_size); for (i = 0; i < flex_gd->count; i++) { ext4_debug( - "adding %s group %u: %u blocks (%d free, %d mdata blocks)\n", + "adding %s group %u: %u blocks (%u free, %u mdata blocks)\n", ext4_bg_has_super(sb, group + i) ? "normal" : "no-super", group + i, group_data[i].blocks_count, @@ -1624,7 +1624,7 @@ static int ext4_flex_group_add(struct super_block *sb, static int ext4_setup_next_flex_gd(struct super_block *sb, struct ext4_new_flex_group_data *flex_gd, ext4_fsblk_t n_blocks_count, - unsigned long flexbg_size) + unsigned int flexbg_size) { struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_super_block *es = sbi->s_es; @@ -2010,8 +2010,9 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) ext4_fsblk_t o_blocks_count; ext4_fsblk_t n_blocks_count_retry = 0; unsigned long last_update_time = 0; - int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex; + int err = 0; int meta_bg; + unsigned int flexbg_size = ext4_flex_bg_size(sbi); /* See if the device is actually as big as what was requested */ bh = ext4_sb_bread(sb, n_blocks_count - 1, 0); -- 2.43.0