reiserfs: fix kernel panic on corrupted directory

When reading corrupted reiserfs directory data, d_reclen could be a
negative number or a big positive number, this can lead to kernel panic or
oop.  The following patch adds a sanity check.

Signed-off-by: Lepton Wu <ytht.net@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Jeff Mahoney <jeffm@suse.com>
Cc: "Vladimir V. Saveliev" <vs@namesys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/fs/reiserfs/dir.c b/fs/reiserfs/dir.c
index ffbfc2caaf20..e6b03d2020c1 100644
--- a/fs/reiserfs/dir.c
+++ b/fs/reiserfs/dir.c
@@ -121,6 +121,16 @@ static int reiserfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
                                         continue;
                                 d_reclen = entry_length(bh, ih, entry_num);
                                 d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh);
+
+                                if (d_reclen <= 0 ||
+                                    d_name + d_reclen > bh->b_data + bh->b_size) {
+                                        /* There is corrupted data in entry,
+                                         * We'd better stop here */
+                                        pathrelse(&path_to_entry);
+                                        ret = -EIO;
+                                        goto out;
+                                }
+
                                 if (!d_name[d_reclen - 1])
                                         d_reclen = strlen(d_name);