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ext4: ensure i_size is smaller than maxbytes

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commit 1a77a028a392fab66dd637cdfac3f888450d00af 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>
This commit is contained in:
Zhang Yi
2025-05-06 09:20:09 +08:00
committed by Greg Kroah-Hartman
parent 68cea04f1f
commit 3e8a5163bc
1 changed files with 2 additions and 1 deletions
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3
fs/ext4/inode.c
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@@ -4939,7 +4939,8 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
ei->i_file_acl |= ei->i_file_acl |=
((__u64)le16_to_cpu(raw_inode->i_file_acl_high)) << 32; ((__u64)le16_to_cpu(raw_inode->i_file_acl_high)) << 32;
inode->i_size = ext4_isize(sb, raw_inode); 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, ext4_error_inode(inode, function, line, 0,
"iget: bad i_size value: %lld", size); "iget: bad i_size value: %lld", size);
ret = -EFSCORRUPTED; ret = -EFSCORRUPTED;