linux-kernel - Re: [GIT] More NFS client fixes for 2.6.24-rc6

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Date:	Thu, 3 Jan 2008 10:30:48 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: [GIT] More NFS client fixes for 2.6.24-rc6


* Trond Myklebust <Trond.Myklebust@...app.com> wrote:

> commit 53478daff2c8b494d2af1ede6611f166f81bc393
> Author: Trond Myklebust <Trond.Myklebust@...app.com>
> Date:   Wed Jan 2 13:28:57 2008 -0500
> 
>     NFS: Fix a possible Oops in fs/nfs/super.c
>     
>     Sigh... commit 4584f520e1f773082ef44ff4f8969a5d992b16ec (NFS: Fix NFS
>     mountpoint crossing...) had a slight flaw: server can be NULL if sget()
>     returned an existing superblock.
>     
>     Fix the fix by dereferencing s->s_fs_info.
>     
>     Also add in the same namespace Oops fix for NFSv4 in both the mountpoint
>     crossing case, and the referral case.
>     
>     Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>

shouldnt this commit have included the full credit of the bugfix:

  http://bugzilla.kernel.org/show_bug.cgi?id=9647

  ------------>
  Description From Adrian Bunk 2007-12-27 12:36

  The Coverity checker spotted that commit
  4584f520e1f773082ef44ff4f8969a5d992b16ec introduced the following NULL
  dereference in 2.6.24-rc6:

  <--  snip  -->
         if (s->s_fs_info != server) {
                 nfs_free_server(server);
                 server = NULL;     <---------------
         }

  ------- Comment #1 From Adrian Bunk 2007-12-27 12:37:42 -------
  The NULL dereference is at the 
  server->nfs_client->rpc_ops->dir_inode_ops.
  <--------------

	Ingo
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