ext2: reject inodes with negative size

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>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 41b8b44a391c..01f6d4be7f9a 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -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;