linux-kernel - [PATCH net v3 2/3] net: liquidio: Fix off-by-one error in VF setup_nic

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Message-Id: <20260127151241.1144039-3-zilin@seu.edu.cn>
Date: Tue, 27 Jan 2026 15:12:40 +0000
From: Zilin Guan <zilin@....edu.cn>
To: horms@...nel.org
Cc: andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	jianhao.xu@....edu.cn,
	kory.maincent@...tlin.com,
	kuba@...nel.org,
	linux-kernel@...r.kernel.org,
	marco.crivellari@...e.com,
	netdev@...r.kernel.org,
	pabeni@...hat.com,
	vadim.fedorenko@...ux.dev,
	Zilin Guan <zilin@....edu.cn>
Subject: [PATCH net v3 2/3] net: liquidio: Fix off-by-one error in VF setup_nic_devices() cleanup

In setup_nic_devices(), the initialization loop jumps to the label
setup_nic_dev_free on failure. The current cleanup loop while(i--)
skip the failing index i, causing a memory leak.

Fix this by changing the loop to iterate from the current index i
down to 0.

Compile tested only. Issue found using code review.

Fixes: 846b46873eeb ("liquidio CN23XX: VF offload features")
Suggested-by: Simon Horman <horms@...nel.org>
Signed-off-by: Zilin Guan <zilin@....edu.cn>
---
 drivers/net/ethernet/cavium/liquidio/lio_vf_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
index e02942dbbcce..050f9feb0b4a 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
@@ -2212,10 +2212,11 @@ static int setup_nic_devices(struct octeon_device *octeon_dev)
 
 setup_nic_dev_free:
 
-	while (i--) {
+	while (i >= 0) {
 		dev_err(&octeon_dev->pci_dev->dev,
 			"NIC ifidx:%d Setup failed\n", i);
 		liquidio_destroy_nic_device(octeon_dev, i);
+		i--;
 	}
 
 setup_nic_dev_done:
-- 
2.34.1