linux-kernel - [PATCH net] net: ti: icssg-prueth: Fix signedness bug in prueth_init_rx

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Date: Tue, 23 Apr 2024 19:15:22 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Roger Quadros <rogerq@...com>
Cc: MD Danish Anwar <danishanwar@...com>, Roger Quadros <rogerq@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Andrew Lunn <andrew@...n.ch>, Jan Kiszka <jan.kiszka@...mens.com>,
	Diogo Ivo <diogo.ivo@...mens.com>, Rob Herring <robh@...nel.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH net] net: ti: icssg-prueth: Fix signedness bug in
 prueth_init_rx_chns()

The rx_chn->irq[] array is unsigned int but it should be signed for the
error handling to work.  Also if k3_udma_glue_rx_get_irq() returns zero
then we should return -ENXIO instead of success.

Fixes: 128d5874c082 ("net: ti: icssg-prueth: Add ICSSG ethernet driver")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
I had previously fixed the issues with the tx_chns() version of this but
I didn't realize there was an rx version.  These functions got moved
around in net-next so that's why I noticed this bug...  Moving the
code around makes applying this to net-next kind of pain.

 drivers/net/ethernet/ti/icssg/icssg_prueth.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.c b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
index cf7b73f8f450..b69af69a1ccd 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
@@ -421,12 +421,14 @@ static int prueth_init_rx_chns(struct prueth_emac *emac,
 		if (!i)
 			fdqring_id = k3_udma_glue_rx_flow_get_fdq_id(rx_chn->rx_chn,
 								     i);
-		rx_chn->irq[i] = k3_udma_glue_rx_get_irq(rx_chn->rx_chn, i);
-		if (rx_chn->irq[i] <= 0) {
-			ret = rx_chn->irq[i];
+		ret = k3_udma_glue_rx_get_irq(rx_chn->rx_chn, i);
+		if (ret <= 0) {
+			if (!ret)
+				ret = -ENXIO;
 			netdev_err(ndev, "Failed to get rx dma irq");
 			goto fail;
 		}
+		rx_chn->irq[i] = ret;
 	}
 
 	return 0;
-- 
2.43.0