RDMA/qib,hfi1: Fix MR reference count leak on write with immediate

commit 1feb40067cf04ae48d65f728d62ca255c9449178 upstream.

The handling of IB_RDMA_WRITE_ONLY_WITH_IMMEDIATE will leak a memory
reference when a buffer cannot be allocated for returning the immediate
data.

The issue is that the rkey validation has already occurred and the RNR
nak fails to release the reference that was fruitlessly gotten.  The
the peer will send the identical single packet request when its RNR
timer pops.

The fix is to release the held reference prior to the rnr nak exit.
This is the only sequence the requires both rkey validation and the
buffer allocation on the same packet.

Cc: Stable <stable@vger.kernel.org> # 4.7+
Tested-by: Tadeusz Struk <tadeusz.struk@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/infiniband/hw/qib/qib_rc.c b/drivers/infiniband/hw/qib/qib_rc.c
index 2f2501890c4ea2b26a9ebd7a82755688605443e3..d614c23a306effe5b0ccf02464f2de38a54fcc73 100644 (file)
--- a/drivers/infiniband/hw/qib/qib_rc.c
+++ b/drivers/infiniband/hw/qib/qib_rc.c
@@ -2086,8 +2086,10 @@ send_last:
                ret = qib_get_rwqe(qp, 1);
                if (ret < 0)
                        goto nack_op_err;
-               if (!ret)
+               if (!ret) {
+                       qib_put_ss(&qp->r_sge);
                        goto rnr_nak;
+               }
                wc.ex.imm_data = ohdr->u.rc.imm_data;
                hdrsize += 4;
                wc.wc_flags = IB_WC_WITH_IMM;