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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2016-12-10 09:55:01 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-06 11:16:22 +0100 |
| commit | 3664877022eab014a669ccb13221f119b7e8dc8d (patch) | |
| tree | 41bae39461b4d231db5c2be48a6bcd7190714cc7 | |
| parent | 1bfcffbb88017c09c1a469507616c88a27037757 (diff) | |
| download | linux-stable-3664877022eab014a669ccb13221f119b7e8dc8d.tar.gz linux-stable-3664877022eab014a669ccb13221f119b7e8dc8d.tar.bz2 linux-stable-3664877022eab014a669ccb13221f119b7e8dc8d.zip | |
ext4: reject inodes with negative size
commit 7e6e1ef48fc02f3ac5d0edecbb0c6087cd758d58 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 f4cdc647ecfc..27e4348efc4e 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4438,6 +4438,7 @@ 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; @@ -4538,6 +4539,11 @@ 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; |