netdev - [PATCH net-next 3/3] bnxt_en: Fix RCU locking for ntuple filters in bnxt_rx_flow

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Message-Id: <20240105235439.28282-4-michael.chan@broadcom.com>
Date: Fri,  5 Jan 2024 15:54:39 -0800
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	pavan.chebbi@...adcom.com,
	andrew.gospodarek@...adcom.com,
	horms@...nel.org
Subject: [PATCH net-next 3/3] bnxt_en: Fix RCU locking for ntuple filters in bnxt_rx_flow_steer()

Similar to the previous patch, RCU locking was released too early
in bnxt_rx_flow_steer().  Fix it to unlock after reading fltr->base.sw_id
to guarantee that fltr won't be freed while we are still reading it.

Fixes: cb5bdd292dc0 ("bnxt_en: Add bnxt_lookup_ntp_filter_from_idx() function")
Reported-by: Simon Horman <horms@...nel.org>
Link: https://lore.kernel.org/netdev/20231225165653.GH5962@kernel.org/
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index fb5af8a34c8f..0aacd3c6ed5c 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -14020,8 +14020,8 @@ static int bnxt_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,
 	rcu_read_lock();
 	fltr = bnxt_lookup_ntp_filter_from_idx(bp, new_fltr, idx);
 	if (fltr) {
-		rcu_read_unlock();
 		rc = fltr->base.sw_id;
+		rcu_read_unlock();
 		goto err_free;
 	}
 	rcu_read_unlock();
-- 
2.30.1


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