This is a note to let you know that I've just added the patch titled
NFS: Fix a delegation callback race
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfs-fix-a-delegation-callback-race.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 755a48a7a4eb05b9c8424e3017d947b2961a60e0 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Date: Sun, 2 Mar 2014 22:03:12 -0500
Subject: NFS: Fix a delegation callback race
From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
commit 755a48a7a4eb05b9c8424e3017d947b2961a60e0 upstream.
The clean-up in commit 36281caa839f ended up removing a NULL pointer check
that is needed in order to prevent an Oops in
nfs_async_inode_return_delegation().
Reported-by: "Yan, Zheng" <zheng.z.yan@xxxxxxxxx>
Link: http://lkml.kernel.org/r/5313E9F6.2020405@xxxxxxxxx
Fixes: 36281caa839f (NFSv4: Further clean-ups of delegation stateid validation)
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfs/delegation.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -540,16 +540,19 @@ int nfs_async_inode_return_delegation(st
rcu_read_lock();
delegation = rcu_dereference(NFS_I(inode)->delegation);
+ if (delegation == NULL)
+ goto out_enoent;
- if (!clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) {
- rcu_read_unlock();
- return -ENOENT;
- }
+ if (!clp->cl_mvops->match_stateid(&delegation->stateid, stateid))
+ goto out_enoent;
nfs_mark_return_delegation(server, delegation);
rcu_read_unlock();
nfs_delegation_run_state_manager(clp);
return 0;
+out_enoent:
+ rcu_read_unlock();
+ return -ENOENT;
}
static struct inode *
Patches currently in stable-queue which might be from trond.myklebust@xxxxxxxxxxxxxxx are
queue-3.4/nfs-fix-a-delegation-callback-race.patch
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