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 @@
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;