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Date: Thu, 22 Oct 2009 15:39:00 -0400 (EDT)
From: Josh Bressers <>
Cc: "Steven M. Christey" <>
Subject: Re: CVE request: kernel: nfsd4: fix null dereference
 creating nfsv4 callback client

Please use CVE-2009-3623 for this.


----- "Eugene Teo" <> wrote:

> Quoting from upstream patch:
> "On setting up the callback to the client, we attempt to use the same
> authentication flavor the client did.  We find an rpc cred to use by 
> calling rpcauth_lookup_credcache(), which assumes that the given 
> authentication flavor has a credentials cache.  However, this is not 
> required to be true--in particular, auth_null does not use one.
> Instead, 
> we should call the auth's lookup_cred() method.
> Without this, a client attempting to mount using nfsv4 and auth_null 
> triggers a null dereference."
> The code was introduced in upstream commit 3cef9ab2 (v2.6.31-rc1),
> fixed 
> in 886e3b7f (v2.6.32-rc1), and was later replaced by 80fc015b in the 
> same version.
> References:
> Thanks, Eugene

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