ext4: ensure i_size is smaller than maxbytes

commit 1a77a02 upstream.

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

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Baokun Li <libaokun1@huawei.com>
Link: https://patch.msgid.link/20250506012009.3896990-4-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: zhangyi089

fs/ext4/inode.c

@@ -4928,7 +4928,8 @@ 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;