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ext2: reject inodes with negative size

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Don't load an inode with a negative size; this causes integer overflow
problems in the VFS.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Darrick J. Wong 2016-12-06 15:59:01 -08:00 committed by Jan Kara
parent c3b004460d
commit b46dc03381
1 changed files with 4 additions and 0 deletions
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4
fs/ext2/inode.c
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@ -1476,6 +1476,10 @@ struct inode *ext2_iget (struct super_block *sb, unsigned long ino)
inode->i_size |= ((__u64)le32_to_cpu(raw_inode->i_size_high)) << 32;
else
ei->i_dir_acl = le32_to_cpu(raw_inode->i_dir_acl);
if (i_size_read(inode) < 0) {
ret = -EFSCORRUPTED;
goto bad_inode;
}
ei->i_dtime = 0;
inode->i_generation = le32_to_cpu(raw_inode->i_generation);
ei->i_state = 0;