linux-kernel - [PATCH 4.18 142/235] NFSv4: Fix a tracepoint Oops in initiate_file

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Date:   Mon, 24 Sep 2018 13:52:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <Anna.Schumaker@...app.com>
Subject: [PATCH 4.18 142/235] NFSv4: Fix a tracepoint Oops in initiate_file_draining()

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Trond Myklebust <trondmy@...il.com>

commit 2a534a7473bf4e7f1c12805113f80c795fc8e89a upstream.

Now that the value of 'ino' can be NULL or an ERR_PTR(), we need to
change the test in the tracepoint.

Fixes: ce5624f7e6675 ("NFSv4: Return NFS4ERR_DELAY when a layout fails...")
Signed-off-by: Trond Myklebust <trond.myklebust@...merspace.com>
Cc: stable@...r.kernel.org # v4.17+
Signed-off-by: Anna Schumaker <Anna.Schumaker@...app.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfs/nfs4trace.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -1194,7 +1194,7 @@ DECLARE_EVENT_CLASS(nfs4_inode_stateid_c
 		TP_fast_assign(
 			__entry->error = error;
 			__entry->fhandle = nfs_fhandle_hash(fhandle);
-			if (inode != NULL) {
+			if (!IS_ERR_OR_NULL(inode)) {
 				__entry->fileid = NFS_FILEID(inode);
 				__entry->dev = inode->i_sb->s_dev;
 			} else {