Re: [Linux-kernel-mentees] [PATCH] hfs, hfsplus: Fix NULL pointer dereference in hfs_find_init()

From: Big Budsupply <bigbudsupply1@gmail.com>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: syzkaller-bugs@googlegroups.com, linux-kernel@vger.kernel.org,
	linux-fsdevel@vger.kernel.org,
	linux-kernel-mentees@lists.linuxfoundation.org,
	Peilin Ye <yepeilin.cs@gmail.com>
Subject: Re: [Linux-kernel-mentees] [PATCH] hfs, hfsplus: Fix NULL pointer dereference in hfs_find_init()
Date: Wed, 12 Aug 2020 12:42:13 +0100	[thread overview]
Message-ID: <CAHwJNhOMUJO2nMMqmfLXJt1ki-3fFbEW=K4h_KEpCobe8r_+iQ@mail.gmail.com> (raw)
In-Reply-To: <20200812085904.GA16441@kadam>

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On Wed, 12 Aug 2020 at 09:59 Dan Carpenter <dan.carpenter@oracle.com> 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);
>
>                                          ^^^^^^^^
>
>
>
> 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
>
>
>
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>
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>
>

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