linux-kernel - Re: [Linux-kernel-mentees] [PATCH] hfs, hfsplus: Fix NULL pointer dereference in hfs_find

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Date:   Wed, 12 Aug 2020 13:23:35 -0400
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-fsdevel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        syzkaller-bugs@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [Linux-kernel-mentees] [PATCH] hfs, hfsplus: Fix NULL pointer
 dereference in hfs_find_init()

On Wed, Aug 12, 2020 at 11:59:04AM +0300, Dan Carpenter wrote:
> Yeah, the patch doesn't work at all.  I looked at one call tree and it
> is:
> 
> hfs_mdb_get() tries to allocate HFS_SB(sb)->ext_tree.
> 
> 	HFS_SB(sb)->ext_tree = hfs_btree_open(sb, HFS_EXT_CNID, hfs_ext_keycmp);
>                     ^^^^^^^^
> 
> hfs_btree_open() calls page = read_mapping_page(mapping, 0, NULL);
> read_mapping_page() calls mapping->a_ops->readpage() which leads to
> hfs_readpage() which leads to hfs_ext_read_extent() which calls
> res = hfs_find_init(HFS_SB(inode->i_sb)->ext_tree, &fd);
>                                          ^^^^^^^^

Thank you for pointing this out! I will try to come up with a better way
to fix it.

Peilin Ye

> So we need ->ext_tree to be non-NULL before we can set ->ext_tree to be
> non-NULL...  :/
> 
> I wonder how long this has been broken and if we should just delete the
> AFS file system.
> 
> regards,
> dan carpenter
>