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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2016-12-10 15:55:01 +0100 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2016-12-10 15:55:01 +0100 |
| commit | 7e6e1ef48fc02f3ac5d0edecbb0c6087cd758d58 (patch) | |
| tree | 9b56e87202bf6e79da606529ef5900053e80f939 /fs/ext4/inode.c | |
| parent | ext4: remove another test in ext4_alloc_file_blocks() (diff) | |
| download | linux-7e6e1ef48fc02f3ac5d0edecbb0c6087cd758d58.tar.xz linux-7e6e1ef48fc02f3ac5d0edecbb0c6087cd758d58.zip | |
ext4: reject inodes with negative size
Don't load an inode with a negative size; this causes integer overflow
problems in the VFS.
[ Added EXT4_ERROR_INODE() to mark file system as corrupted. -TYT]
Fixes: a48380f769df (ext4: rename i_dir_acl to i_size_high)
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Diffstat (limited to '')
| -rw-r--r-- | fs/ext4/inode.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index a1eac0054203..f9f892212308 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4553,6 +4553,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino) struct inode *inode; journal_t *journal = EXT4_SB(sb)->s_journal; long ret; + loff_t size; int block; uid_t i_uid; gid_t i_gid; @@ -4655,6 +4656,11 @@ 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(raw_inode); + if ((size = i_size_read(inode)) < 0) { + EXT4_ERROR_INODE(inode, "bad i_size value: %lld", size); + ret = -EFSCORRUPTED; + goto bad_inode; + } ei->i_disksize = inode->i_size; #ifdef CONFIG_QUOTA ei->i_reserved_quota = 0; |