Return-Path: linux-nfs-owner@vger.kernel.org Received: from cmexedge2.ext.emulex.com ([138.239.224.100]:22131 "EHLO CMEXEDGE2.ext.emulex.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754988AbaDGXBm (ORCPT ); Mon, 7 Apr 2014 19:01:42 -0400 From: To: CC: , Devesh Sharma Subject: [PATCH] NFS-RDMA: fix qp pointer validation checks Date: Tue, 8 Apr 2014 04:00:05 +0530 MIME-Version: 1.0 Content-Type: text/plain Message-ID: Sender: linux-nfs-owner@vger.kernel.org List-ID: From: Devesh Sharma If the rdma_create_qp fails to create qp due to device firmware being in invalid state xprtrdma still tries to destroy the non-existant qp and ends up in a NULL pointer reference crash. Adding proper checks for vaidating QP pointer avoids this to happen. Signed-off-by: Devesh Sharma --- net/sunrpc/xprtrdma/verbs.c | 34 ++++++++++++++++++++++++++++------ 1 files changed, 28 insertions(+), 6 deletions(-) diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index 9372656..c01d91e 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -620,7 +620,7 @@ rpcrdma_ia_close(struct rpcrdma_ia *ia) __func__, rc); } if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) { - if (ia->ri_id->qp) + if (!IS_ERR(ia->ri_id->qp)) rdma_destroy_qp(ia->ri_id); rdma_destroy_id(ia->ri_id); ia->ri_id = NULL; @@ -794,7 +794,7 @@ rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) dprintk("RPC: %s: entering, connected is %d\n", __func__, ep->rep_connected); - if (ia->ri_id->qp) { + if (!IS_ERR(ia->ri_id->qp)) { rc = rpcrdma_ep_disconnect(ep, ia); if (rc) dprintk("RPC: %s: rpcrdma_ep_disconnect" @@ -831,10 +831,12 @@ rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) if (ep->rep_connected != 0) { struct rpcrdma_xprt *xprt; retry: - rc = rpcrdma_ep_disconnect(ep, ia); - if (rc && rc != -ENOTCONN) - dprintk("RPC: %s: rpcrdma_ep_disconnect" + if (!IS_ERR(ia->ri_id->qp)) { + rc = rpcrdma_ep_disconnect(ep, ia); + if (rc && rc != -ENOTCONN) + dprintk("RPC: %s: rpcrdma_ep_disconnect" " status %i\n", __func__, rc); + } rpcrdma_clean_cq(ep->rep_cq); xprt = container_of(ia, struct rpcrdma_xprt, rx_ia); @@ -859,7 +861,9 @@ retry: goto out; } /* END TEMP */ - rdma_destroy_qp(ia->ri_id); + if (!IS_ERR(ia->ri_id->qp)) { + rdma_destroy_qp(ia->ri_id); + } rdma_destroy_id(ia->ri_id); ia->ri_id = id; } @@ -1557,6 +1561,13 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg, frmr_wr.wr.fast_reg.rkey = seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey; DECR_CQCOUNT(&r_xprt->rx_ep); + if (IS_ERR(ia->ri_is->qp)) { + rc = PTR_ERR(ia->ri_is->qp); + while (i--) + rpcrdma_unmap_one(ia, --seg); + goto out; + } + rc = ib_post_send(ia->ri_id->qp, post_wr, &bad_wr); if (rc) { @@ -1571,6 +1582,7 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg, seg1->mr_len = len; } *nsegs = i; +out: return rc; } @@ -1592,6 +1604,10 @@ rpcrdma_deregister_frmr_external(struct rpcrdma_mr_seg *seg, invalidate_wr.ex.invalidate_rkey = seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey; DECR_CQCOUNT(&r_xprt->rx_ep); + if (IS_ERR(ia->ri_id->qp)) { + return PTR_ERR(ia->ri_id->qp); + } + rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr); if (rc) dprintk("RPC: %s: failed ib_post_send for invalidate," @@ -1923,6 +1939,9 @@ rpcrdma_ep_post(struct rpcrdma_ia *ia, send_wr.send_flags = IB_SEND_SIGNALED; } + if (IS_ERR(ia->ri_id->qp)) + return PTR_ERR(ia->ri_id->qp); + rc = ib_post_send(ia->ri_id->qp, &send_wr, &send_wr_fail); if (rc) dprintk("RPC: %s: ib_post_send returned %i\n", __func__, @@ -1951,6 +1970,9 @@ rpcrdma_ep_post_recv(struct rpcrdma_ia *ia, rep->rr_iov.addr, rep->rr_iov.length, DMA_BIDIRECTIONAL); DECR_CQCOUNT(ep); + + if (IS_ERR(ia->ri_id->qp)) + return PTR_ERR(ia->ri_id->qp); rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail); if (rc) -- 1.7.1