linux-kernel - Re: [2 regressions] Current git cannot find root device on x86-64 (HP nx6325), NFS broken

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Message-Id: <1239061566.6196.13.camel@heimdal.trondhjem.org>
Date:	Mon, 06 Apr 2009 16:46:06 -0700
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tejun Heo <htejun@...il.com>
Subject: Re: [2 regressions] Current git cannot find root device on x86-64
 (HP nx6325), NFS broken

On Tue, 2009-04-07 at 00:47 +0200, Rafael J. Wysocki wrote:
> Also, mounting directories over NFS doesn't work (I think it oopses, but
> didn't have the time to look at it more closely).

There is a known double free issue that affects the 'proto=' mount
option (we call kfree(string) twice). Please could you check that the
following patch fixes it for you?

Cheers
  Trond

--------------------------------------------------------------------
>>From a3e6cc62dce11c75249f01423eb9b41531759d36 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust@...app.com>
Date: Mon, 6 Apr 2009 16:41:35 -0700
Subject: [PATCH] NFS: Fix a double free in nfs_parse_mount_options()

Due to an apparent typo, commit a67d18f89f5782806135aad4ee012ff78d45aae7
(NFS: load the rpc/rdma transport module automatically) lead to the
'proto=' mount option doing a double free, while Opt_mountproto leaks a
string.

Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
---
 fs/nfs/super.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 82eaadb..6717200 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1228,7 +1228,6 @@ static int nfs_parse_mount_options(char *raw,
 				goto out_nomem;
 			token = match_token(string,
 					    nfs_xprt_protocol_tokens, args);
-			kfree(string);
 
 			switch (token) {
 			case Opt_xprt_udp:
@@ -1258,6 +1257,7 @@ static int nfs_parse_mount_options(char *raw,
 				goto out_nomem;
 			token = match_token(string,
 					    nfs_xprt_protocol_tokens, args);
+			kfree(string);
 
 			switch (token) {
 			case Opt_xprt_udp:
-- 
1.6.0.4



-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com
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