This is a note to let you know that I've just added the patch titled
nfsd: return correct openowner when there is a race to put one in the hash
to the 3.19-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:
nfsd-return-correct-openowner-when-there-is-a-race-to-put-one-in-the-hash.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c5952338bfc234e54deda45b7228f610a545e28a Mon Sep 17 00:00:00 2001
From: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
Date: Mon, 23 Mar 2015 10:53:42 -0400
Subject: nfsd: return correct openowner when there is a race to put one in the hash
From: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
commit c5952338bfc234e54deda45b7228f610a545e28a upstream.
alloc_init_open_stateowner can return an already freed entry if there is
a race to put openowners in the hashtable.
In commit 7ffb588086e9, we changed it so that we allocate and initialize
an openowner, and then check to see if a matching one got stuffed into
the hashtable in the meantime. If it did, then we free the one we just
allocated and take a reference on the one already there. There is a bug
here though. The code will then return the pointer to the one that was
allocated (and has now been freed).
This wasn't evident before as this race almost never occurred. The Linux
kernel client used to serialize requests for a single openowner. That
has changed now with v4.0 kernels, and this race can now easily occur.
Fixes: 7ffb588086e9
Cc: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Reported-by: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jeff Layton <jeff.layton@xxxxxxxxxxxxxxx>
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfsd/nfs4state.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3228,7 +3228,7 @@ alloc_init_open_stateowner(unsigned int
} else
nfs4_free_openowner(&oo->oo_owner);
spin_unlock(&clp->cl_lock);
- return oo;
+ return ret;
}
static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
Patches currently in stable-queue which might be from jlayton@xxxxxxxxxxxxxxx are
queue-3.19/sunrpc-make-debugfs-file-creation-failure-non-fatal.patch
queue-3.19/nfsd-return-correct-openowner-when-there-is-a-race-to-put-one-in-the-hash.patch
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