netdev - [PATCH net] cxgb4: fix the panic caused by non smac rewrite

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Date:   Wed, 18 Nov 2020 20:02:13 +0530
From:   Raju Rangoju <rajur@...lsio.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, rajur@...lsio.com
Subject: [PATCH net] cxgb4: fix the panic caused by non smac rewrite

SMT entry is allocated only when loopback Source MAC
rewriting is requested. Accessing SMT entry for non
smac rewrite cases results in kernel panic.

Fix the panic caused by non smac rewrite

Fixes: 937d84205884 ("cxgb4: set up filter action after rewrites")
Signed-off-by: Raju Rangoju <rajur@...lsio.com>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
index 4e55f7081644..83b46440408b 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
@@ -880,7 +880,8 @@ int set_filter_wr(struct adapter *adapter, int fidx)
 		 FW_FILTER_WR_OVLAN_VLD_V(f->fs.val.ovlan_vld) |
 		 FW_FILTER_WR_IVLAN_VLDM_V(f->fs.mask.ivlan_vld) |
 		 FW_FILTER_WR_OVLAN_VLDM_V(f->fs.mask.ovlan_vld));
-	fwr->smac_sel = f->smt->idx;
+	if (f->fs.newsmac)
+		fwr->smac_sel = f->smt->idx;
 	fwr->rx_chan_rx_rpl_iq =
 		htons(FW_FILTER_WR_RX_CHAN_V(0) |
 		      FW_FILTER_WR_RX_RPL_IQ_V(adapter->sge.fw_evtq.abs_id));
-- 
2.9.5