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.
V0: Using IS_ERR() to check validity of qp pointer.
V1: Use of IS_ERR() will not be able to catch NULL QP pointers as rdma_create_qp() returnes NULL in case
ib_create_qp verb is failed. Therefore, changed from usage of IS_ERR to null pointer check.
V2: ib_post_send() should not abort after DECR_CQCOUNT() checking for NULL pointer was causing exit from functions
after decrementing CQCOUNT(). Fixed this in V2.
Signed-off-by: Devesh Sharma <devesh.sharma@xxxxxxxxxx>
---
net/sunrpc/xprtrdma/verbs.c | 92 ++++++++++++++++++++++++++-----------------
1 files changed, 56 insertions(+), 36 deletions(-)
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 9372656..9e56baf 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -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 (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 +861,8 @@ retry:
goto out;
}
/* END TEMP */
- rdma_destroy_qp(ia->ri_id);
+ if (ia->ri_id->qp)
+ rdma_destroy_qp(ia->ri_id);
rdma_destroy_id(ia->ri_id);
ia->ri_id = id;
}
@@ -1555,22 +1558,30 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg,
IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE :
IB_ACCESS_REMOTE_READ);
frmr_wr.wr.fast_reg.rkey = seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey;
- DECR_CQCOUNT(&r_xprt->rx_ep);
- rc = ib_post_send(ia->ri_id->qp, post_wr, &bad_wr);
+ if (!ia->ri_is->qp) {
+ DECR_CQCOUNT(&r_xprt->rx_ep);
+ rc = ib_post_send(ia->ri_id->qp, post_wr, &bad_wr);
- if (rc) {
- dprintk("RPC: %s: failed ib_post_send for register,"
- " status %i\n", __func__, rc);
- while (i--)
- rpcrdma_unmap_one(ia, --seg);
+ if (rc) {
+ dprintk("RPC: %s: failed ib_post_send for register,"
+ " status %i\n", __func__, rc);
+ goto out;
+ } else {
+ seg1->mr_rkey = seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey;
+ seg1->mr_base = seg1->mr_dma + pageoff;
+ seg1->mr_nsegs = i;
+ seg1->mr_len = len;
+ }
} else {
- seg1->mr_rkey = seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey;
- seg1->mr_base = seg1->mr_dma + pageoff;
- seg1->mr_nsegs = i;
- seg1->mr_len = len;
+ rc = -EINVAL;
+ goto out;
}
+
*nsegs = i;
+out:
+ while (i--)
+ rpcrdma_unmap_one(ia, --seg);
return rc;
}
@@ -1590,12 +1601,16 @@ rpcrdma_deregister_frmr_external(struct rpcrdma_mr_seg *seg,
invalidate_wr.opcode = IB_WR_LOCAL_INV;
invalidate_wr.send_flags = IB_SEND_SIGNALED;
invalidate_wr.ex.invalidate_rkey = seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey;
- DECR_CQCOUNT(&r_xprt->rx_ep);
- rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr);
- if (rc)
- dprintk("RPC: %s: failed ib_post_send for invalidate,"
- " status %i\n", __func__, rc);
+ if (ia->ri_id->qp) {
+ DECR_CQCOUNT(&r_xprt->rx_ep);
+ rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr);
+ if (rc)
+ dprintk("RPC: %s: failed ib_post_send for invalidate,"
+ " status %i\n", __func__, rc);
+ } else
+ rc = -EINVAL;
+
return rc;
}
@@ -1916,17 +1931,19 @@ rpcrdma_ep_post(struct rpcrdma_ia *ia,
req->rl_send_iov[0].addr, req->rl_send_iov[0].length,
DMA_TO_DEVICE);
- if (DECR_CQCOUNT(ep) > 0)
- send_wr.send_flags = 0;
- else { /* Provider must take a send completion every now and then */
- INIT_CQCOUNT(ep);
- send_wr.send_flags = IB_SEND_SIGNALED;
- }
-
- 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__,
- rc);
+ if (ia->ri_id->qp) {
+ if (DECR_CQCOUNT(ep) > 0)
+ send_wr.send_flags = 0;
+ else { /* Provider must take a send completion every now and then */
+ INIT_CQCOUNT(ep);
+ send_wr.send_flags = IB_SEND_SIGNALED
+ }
+ 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__,
+ rc);
+ } else
+ rc = -EINVAL;
out:
return rc;
}
@@ -1950,11 +1967,14 @@ rpcrdma_ep_post_recv(struct rpcrdma_ia *ia,
ib_dma_sync_single_for_cpu(ia->ri_id->device,
rep->rr_iov.addr, rep->rr_iov.length, DMA_BIDIRECTIONAL);
- DECR_CQCOUNT(ep);
- rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail);
+ if (ia->ri_id->qp) {
+ DECR_CQCOUNT(ep);
+ rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail);
+ if (rc)
+ dprintk("RPC: %s: ib_post_recv returned %i\n", __func__,
+ rc);
+ } else
+ rc = -EINVAL;
- if (rc)
- dprintk("RPC: %s: ib_post_recv returned %i\n", __func__,
- rc);
return rc;
}
--
1.7.1
--
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