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Date: Thu, 5 Nov 2009 12:23:39 -0500 (EST)
From: Josh Bressers <>
Cc: "Steven M. Christey" <>
Subject: Re: CVE request: kernel: NULL pointer dereference in

Please use CVE-2009-3726



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

> Quote from upstream commit:
> "We just had a case in which a buggy server occasionally returns the 
> wrong attributes during an OPEN call. While the client does catch this
> sort of condition in nfs4_open_done(), and causes the
> nfs4_atomic_open() 
> to return -EISDIR, the logic in nfs_atomic_lookup() is broken, since
> it 
> causes a fallback to an ordinary lookup instead of just returning the
> error.
> When the buggy server then returns a regular file for the fallback 
> lookup, the VFS allows the open, and bad things start to happen, since
> the open file doesn't have any associated NFSv4 state.
> The fix is firstly to return the EISDIR/ENOTDIR errors immediately,
> and 
> secondly to ensure that we are always careful when dereferencing the 
> nfs_open_context state pointer."
> Upstream commit:
> (v2.6.31-rc4)
> Steps to reproduce the issue/backtraces:
> References:
> Thanks, Eugene

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