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Commit 129a10fb authored by Alexander Schmidt's avatar Alexander Schmidt Committed by Roland Dreier
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IB/ehca: Check idr_find() return value 



The idr_find() function may fail when trying to get the QP that is
associated with a CQE, e.g. when a QP has been destroyed between the
generation of a CQE and the poll request for it.  In consequence, the
return value of idr_find() must be checked and the CQE must be
discarded when the QP cannot be found.

Signed-off-by: default avatarAlexander Schmidt <alexs@linux.vnet.ibm.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 17c2b53a

drivers/infiniband/hw/ehca/ehca_reqs.c

+3 −1
Original line number Diff line number Diff line
@@ -680,8 +680,10 @@ static inline int ehca_poll_cq_one(struct ib_cq *cq, struct ib_wc *wc) 


	read_lock(&ehca_qp_idr_lock);

	my_qp = idr_find(&ehca_qp_idr, cqe->qp_token);

	wc->qp = &my_qp->ib_qp;

	read_unlock(&ehca_qp_idr_lock);

	if (!my_qp)

		goto repoll;

	wc->qp = &my_qp->ib_qp;



	wc->byte_len = cqe->nr_bytes_transferred;

	wc->pkey_index = cqe->pkey_index;