Re: 2.6.11-rc2-mm1: kernel bad access while booting diskless client

[Andreas Gruenbacher <agruen@suse.de>]

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Hello,

here is a fix for a NULL pointer access problem with NFSv2 that isn't in
2.6.11-rc2-mm1, but it can't explain this NULL inode->i_op.

-- Andreas.

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From: Andreas Gruenbacher <agruen@suse.de>
To: Andrew Morton <akpm@osdl.org>, Neil Brown <neilb@cse.unsw.edu.au>, Trond Myklebust <trond.myklebust@fys.uio.no>, linux-kernel@vger.kernel.org
Cc: Olaf Kirch <okir@suse.de>, "Andries E. Brouwer" <Andries.Brouwer@cwi.nl>, Buck Huppmann <buchk@pobox.com>
Subject: Re: [patch 12/13] ACL umask handling workaround in nfs client
Date: Tue, 25 Jan 2005 02:20:41 +0100
Message-ID: <200501250220.41618.agruen@suse.de>

Hello,

this patch has an NFSv2 problem that I haven't tripped over until today. The 
fix is this:

------- 8< -------
Fix NFSv2 null pointer access

With NFSv2 we would try to follow a NULL getacl and setacl function
pointer here. Add the missing checks.

Signed-off-by: Andreas Gruenbacher <agruen@suse.de>

Index: linux-2.6.10/fs/nfs/dir.c
===================================================================
--- linux-2.6.10.orig/fs/nfs/dir.c
+++ linux-2.6.10/fs/nfs/dir.c
@@ -984,6 +984,9 @@ static int nfs_set_default_acl(struct in
 	struct posix_acl *dfacl, *acl;
 	int error = 0;
 
+	if (NFS_PROTO(inode)->version != 3 ||
+	    !NFS_PROTO(dir)->getacl || !NFS_PROTO(inode)->setacls)
+		return 0;
 	dfacl = NFS_PROTO(dir)->getacl(dir, ACL_TYPE_DEFAULT);
 	if (IS_ERR(dfacl)) {
 		error = PTR_ERR(dfacl);


Regards,
-- 
Andreas Gruenbacher <agruen@suse.de>
SUSE Labs, SUSE LINUX PRODUCTS GMBH
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