This is a note to let you know that I've just added the patch titled
NFSv4: Fix state reference counting in _nfs4_opendata_reclaim_to_nfs4_state
to the 3.12-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:
nfsv4-fix-state-reference-counting-in-_nfs4_opendata_reclaim_to_nfs4_state.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d49f042aeec99c5f87160bb52dd52088b1051311 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Date: Mon, 28 Oct 2013 14:57:12 -0400
Subject: NFSv4: Fix state reference counting in _nfs4_opendata_reclaim_to_nfs4_state
From: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
commit d49f042aeec99c5f87160bb52dd52088b1051311 upstream.
Currently, if the call to nfs_refresh_inode fails, then we end up leaking
a reference count, due to the call to nfs4_get_open_state.
While we're at it, replace nfs4_get_open_state with a simple call to
atomic_inc(); there is no need to do a full lookup of the struct nfs_state
since it is passed as an argument in the struct nfs4_opendata, and
is already assigned to the variable 'state'.
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfs/nfs4proc.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1326,11 +1326,6 @@ _nfs4_opendata_reclaim_to_nfs4_state(str
goto update;
}
- ret = -ENOMEM;
- state = nfs4_get_open_state(inode, data->owner);
- if (state == NULL)
- goto err;
-
ret = nfs_refresh_inode(inode, &data->f_attr);
if (ret)
goto err;
@@ -1342,6 +1337,7 @@ _nfs4_opendata_reclaim_to_nfs4_state(str
update:
update_open_stateid(state, &data->o_res.stateid, NULL,
data->o_arg.fmode);
+ atomic_inc(&state->count);
return state;
err:
Patches currently in stable-queue which might be from Trond.Myklebust@xxxxxxxxxx are
queue-3.12/nfsv4.2-fix-a-mismatch-between-linux-labeled-nfs-and-the-nfsv4.2-spec.patch
queue-3.12/nfs-fix-oops-when-trying-to-set-selinux-label.patch
queue-3.12/nfs-fix-a-missing-initialisation-when-reading-the-selinux-label.patch
queue-3.12/nfsv4-fix-a-use-after-free-situation-in-_nfs4_proc_getlk.patch
queue-3.12/nfs-fix-inverted-test-for-delegation-in-nfs4_reclaim_open_state.patch
queue-3.12/nfsv4-fix-null-dereference-in-open-recover.patch
queue-3.12/nfs-don-t-retry-detect_trunking-with-rpc_auth_unix-more-than-once.patch
queue-3.12/nfsv4-don-t-reprocess-cached-open-claim_previous.patch
queue-3.12/nfsv4-fix-state-reference-counting-in-_nfs4_opendata_reclaim_to_nfs4_state.patch
queue-3.12/nfsv4-don-t-fail-on-missing-fattr-in-open-recover.patch
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