RDMA/iw_cxgb4: Fix the unchecked ep dereference

[ Upstream commit 3352976c892301fd576a2e9ff0ac7337b2e2ca48 ]

The patch 944661dd97f4: "RDMA/iw_cxgb4: atomically lookup ep and get a
reference" from May 6, 2016, leads to the following Smatch complaint:

    drivers/infiniband/hw/cxgb4/cm.c:2953 terminate()
    error: we previously assumed 'ep' could be null (see line 2945)

Fixes: 944661dd97 ("RDMA/iw_cxgb4: atomically lookup ep and get a reference")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Raju Rangoju <rajur@chelsio.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
tirimbino
Raju Rangoju 6 years ago committed by Greg Kroah-Hartman
parent 45ad6d87fd
commit 70da6cce28
  1. 17
      drivers/infiniband/hw/cxgb4/cm.c

@ -2923,15 +2923,18 @@ static int terminate(struct c4iw_dev *dev, struct sk_buff *skb)
ep = get_ep_from_tid(dev, tid);
BUG_ON(!ep);
if (ep && ep->com.qp) {
pr_warn("TERM received tid %u qpid %u\n",
tid, ep->com.qp->wq.sq.qid);
attrs.next_state = C4IW_QP_STATE_TERMINATE;
c4iw_modify_qp(ep->com.qp->rhp, ep->com.qp,
C4IW_QP_ATTR_NEXT_STATE, &attrs, 1);
if (ep) {
if (ep->com.qp) {
pr_warn("TERM received tid %u qpid %u\n", tid,
ep->com.qp->wq.sq.qid);
attrs.next_state = C4IW_QP_STATE_TERMINATE;
c4iw_modify_qp(ep->com.qp->rhp, ep->com.qp,
C4IW_QP_ATTR_NEXT_STATE, &attrs, 1);
}
c4iw_put_ep(&ep->com);
} else
pr_warn("TERM received tid %u no ep/qp\n", tid);
c4iw_put_ep(&ep->com);
return 0;
}

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