qib_lookup_qpn() appears to leak pointer out of rcu_read_unlock()

[Paul E. McKenney]

Hello!

The qib_lookup_qpn() function does RCU pointer traversals within RCU
read-side critical sections as required, but the qp pointer is returned
from this function after it does rcu_read_unlock().  One of the callers,
qib_rcv_hdrerr(), dereferences this pointer upon return.

This appears to me to be a bug.  From what I can see, the structure
pointed to by qp could be freed immediately after the rcu_read_unlock(),
which would result in a SEGV when qib_rcv_hdrerr() does its later
spin_lock(&qp->r_lock).

So what am I missing here?

							Thanx, Paul

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