IB/mad: Fix address handle leak in mad_rmpp

The address handle associated with dual-sided RMPP direction switch
ACKs is never destroyed.  Free the AH for ACKs which fall into this
category.

Problem was reported by Dotan Barak <dotanb@dev.mellanox.co.il>.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/infiniband/core/mad_rmpp.c b/drivers/infiniband/core/mad_rmpp.c
index 3663fd7022b..d43bc62005b 100644
--- a/drivers/infiniband/core/mad_rmpp.c
+++ b/drivers/infiniband/core/mad_rmpp.c
@@ -163,8 +163,10 @@ static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
                                  hdr_len, 0, GFP_KERNEL);
         if (IS_ERR(msg))
                 ib_destroy_ah(ah);
-        else
+        else {
                 msg->ah = ah;
+                msg->context[0] = ah;
+        }
 
         return msg;
 }
@@ -197,9 +199,7 @@ static void ack_ds_ack(struct ib_mad_agent_private *agent,
 
 void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
 {
-        struct ib_rmpp_mad *rmpp_mad = mad_send_wc->send_buf->mad;
-
-        if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_ACK)
+        if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah)
                 ib_destroy_ah(mad_send_wc->send_buf->ah);
         ib_free_send_mad(mad_send_wc->send_buf);
 }