From d38b7aa7fc3371b52d036748028db50b585ade2e Mon Sep 17 00:00:00 2001 From: Eric Sesterhenn Date: Wed, 15 Oct 2008 22:04:11 -0700 Subject: [PATCH] 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 Signed-off-by: Eric Sesterhenn Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/hfs/catalog.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/hfs/catalog.c b/fs/hfs/catalog.c index ba851576ebb1..6d98f116ca03 100644 --- 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); } -- 2.20.1