linux-ext4 - [PATCH v2 4/4] ext4: ensure i_size is smaller than maxbytes

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Message-ID: <20250506012009.3896990-4-yi.zhang@huaweicloud.com>
Date: Tue,  6 May 2025 09:20:09 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: linux-ext4@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	tytso@....edu,
	adilger.kernel@...ger.ca,
	jack@...e.cz,
	wanghaichi0403@...il.com,
	yi.zhang@...wei.com,
	yi.zhang@...weicloud.com,
	libaokun1@...wei.com,
	yukuai3@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH v2 4/4] ext4: ensure i_size is smaller than maxbytes

From: Zhang Yi <yi.zhang@...wei.com>

The inode i_size cannot be larger than maxbytes, check it while loading
inode from the disk.

Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
Reviewed-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/inode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 5691966a19e1..072b61140d12 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4922,7 +4922,8 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
 		ei->i_file_acl |=
 			((__u64)le16_to_cpu(raw_inode->i_file_acl_high)) << 32;
 	inode->i_size = ext4_isize(sb, raw_inode);
-	if ((size = i_size_read(inode)) < 0) {
+	size = i_size_read(inode);
+	if (size < 0 || size > ext4_get_maxbytes(inode)) {
 		ext4_error_inode(inode, function, line, 0,
 				 "iget: bad i_size value: %lld", size);
 		ret = -EFSCORRUPTED;
-- 
2.46.1