From 8e44a0805fc9d77475060280136aa491aa7d7060 Mon Sep 17 00:00:00 2001
From: jvrao <jvrao@linux.vnet.ibm.com>
Date: Wed, 25 Aug 2010 16:27:06 +0000
Subject: net/9p: Add a Warning to catch NULL fids passed to p9_client_clunk().

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

diff --git a/net/9p/client.c b/net/9p/client.c
index c155cc4..e50ec80 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1168,6 +1168,12 @@ int p9_client_clunk(struct p9_fid *fid)
 	struct p9_client *clnt;
 	struct p9_req_t *req;
 
+	if (!fid) {
+		P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
+		dump_stack();
+		return 0;
+	}
+
 	P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
 	err = 0;
 	clnt = fid->clnt;
-- 
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