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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>
This commit is contained in:
Eric Sesterhenn 2008-10-15 22:04:11 -07:00 committed by Linus Torvalds
parent 649f1ee6c7
commit d38b7aa7fc
1 changed files with 4 additions and 0 deletions
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4
fs/hfs/catalog.c
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@ -190,6 +190,10 @@ int hfs_cat_find_brec(struct super_block *sb, u32 cnid,
fd->search_key->cat.ParID = rec.thread.ParID; fd->search_key->cat.ParID = rec.thread.ParID;
len = fd->search_key->cat.CName.len = rec.thread.CName.len; 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); memcpy(fd->search_key->cat.CName.name, rec.thread.CName.name, len);
return hfs_brec_find(fd); return hfs_brec_find(fd);
} }