linux-kernel - [PATCH net v4 2/3] net: liquidio: Fix off-by-one error in PF setup_nic

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Message-Id: <20260128154440.278369-3-zilin@seu.edu.cn>
Date: Wed, 28 Jan 2026 15:44:39 +0000
From: Zilin Guan <zilin@....edu.cn>
To: andrew+netdev@...n.ch
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	kory.maincent@...tlin.com,
	horms@...nel.org,
	jianhao.xu@....edu.cn,
	marco.crivellari@...e.com,
	vadim.fedorenko@...ux.dev,
	Zilin Guan <zilin@....edu.cn>
Subject: [PATCH net v4 2/3] net: liquidio: Fix off-by-one error in PF 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.

Also, decrement i in the devlink_alloc failure path to point to the
last successfully allocated index.

Compile tested only. Issue found using code review.

Fixes: f21fb3ed364b ("Add support of Cavium Liquidio ethernet adapters")
Suggested-by: Simon Horman <horms@...nel.org>
Signed-off-by: Zilin Guan <zilin@....edu.cn>
---
 drivers/net/ethernet/cavium/liquidio/lio_main.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_main.c b/drivers/net/ethernet/cavium/liquidio/lio_main.c
index 1f10b1b22a1e..c1a3df225254 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_main.c
@@ -3750,6 +3750,7 @@ static int setup_nic_devices(struct octeon_device *octeon_dev)
 	if (!devlink) {
 		device_unlock(&octeon_dev->pci_dev->dev);
 		dev_err(&octeon_dev->pci_dev->dev, "devlink alloc failed\n");
+		i--;
 		goto setup_nic_dev_free;
 	}
 
@@ -3765,11 +3766,11 @@ static int setup_nic_devices(struct octeon_device *octeon_dev)
 
 setup_nic_dev_free:
 
-	while (i--) {
+	do {
 		dev_err(&octeon_dev->pci_dev->dev,
 			"NIC ifidx:%d Setup failed\n", i);
 		liquidio_destroy_nic_device(octeon_dev, i);
-	}
+	} while (i--);
 
 setup_nic_dev_done:
 
-- 
2.34.1