[PATCH] [net/9p] Add a Warning to catch NULL fids passed to p9_client_clunk().

["Venkateswararao Jujjuri (JV)" <jvrao@xxxxxxxxxxxxxxxxxx>]

Signed-off-by: Venkateswararao Jujjuri <jvrao@xxxxxxxxxxxxxxxxxx>
---
 net/9p/client.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/net/9p/client.c b/net/9p/client.c
index dc6f2f2..aa7be29 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1201,6 +1201,12 @@ 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;
-- 
1.6.5.2

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