hfs: fix namelength memory corruption

Fix a stack corruption caused by a corrupted hfs filesystem.  If the
catalog name length is corrupted the memcpy overwrites the catalog btree
structure.  Since the field is limited to HFS_NAMELEN bytes in the
structure and the file format, we throw an error if it is too long.

Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/hfs/catalog.c b/fs/hfs/catalog.c
index ba85157..6d98f11 100644 (file)
--- a/fs/hfs/catalog.c
+++ b/fs/hfs/catalog.c
@@ -190,6 +190,10 @@ int hfs_cat_find_brec(struct super_block *sb, u32 cnid,
 
        fd->search_key->cat.ParID = rec.thread.ParID;
        len = fd->search_key->cat.CName.len = rec.thread.CName.len;
+       if (len > HFS_NAMELEN) {
+               printk(KERN_ERR "hfs: bad catalog namelength\n");
+               return -EIO;
+       }
        memcpy(fd->search_key->cat.CName.name, rec.thread.CName.name, len);
        return hfs_brec_find(fd);
 }