linux-kernel - Re: [PATCH] AFS: Stop readlink() on AFS crashing because file not passed to afs

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Date:	Thu, 27 Aug 2009 14:53:59 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Howells <dhowells@...hat.com>
Cc:	torvalds@...ux-foundation.org, linux-afs@...ts.infradead.org,
	linux-kernel@...r.kernel.org, dhowells@...hat.com, anton@...ba.org,
	stable@...nel.org
Subject: Re: [PATCH] AFS: Stop readlink() on AFS crashing because file not
 passed to afs_readpage()

On Thu, 27 Aug 2009 13:22:31 +0100
David Howells <dhowells@...hat.com> wrote:

> kAFS crashes when asked to read a symbolic link because page_getlink() passes a
> NULL file pointer to read_mapping_page(), but afs_readpage() expects a file
> pointer from which to extract a key.
> 
> Modify afs_readpage() to request the appropriate key from the calling process's
> keyrings if a file struct is not supplied with one attached.

That seems like a rather large bug.

To which kernel version(s) should we apply this?

Thanks.
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