netdev - [PATCH net v2] net: ethernet: ti: am65-cpsw: fix freeing IRQ in am65_cpsw_nuss_remove_tx

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Message-Id: <20250116-am65-cpsw-fix-tx-irq-free-v2-1-ada49409a45f@kernel.org>
Date: Thu, 16 Jan 2025 15:54:49 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Grygorii Strashko <grygorii.strashko@...com>, 
 Siddharth Vadapalli <s-vadapalli@...com>
Cc: srk@...com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Roger Quadros <rogerq@...nel.org>, Simon Horman <horms@...nel.org>
Subject: [PATCH net v2] net: ethernet: ti: am65-cpsw: fix freeing IRQ in
 am65_cpsw_nuss_remove_tx_chns()

When getting the IRQ we use k3_udma_glue_tx_get_irq() which returns
negative error value on error. So not NULL check is not sufficient
to deteremine if IRQ is valid. Check that IRQ is greater then zero
to ensure it is valid.

There is no issue at probe time but at runtime user can invoke
.set_channels which results in the following call chain.
am65_cpsw_set_channels()
 am65_cpsw_nuss_update_tx_rx_chns()
  am65_cpsw_nuss_remove_tx_chns()
  am65_cpsw_nuss_init_tx_chns()

At this point if am65_cpsw_nuss_init_tx_chns() fails due to
k3_udma_glue_tx_get_irq() then tx_chn->irq will be set to a
negative value.

Then, at subsequent .set_channels with higher channel count we
will attempt to free an invalid IRQ in am65_cpsw_nuss_remove_tx_chns()
leading to a kernel warning.

The issue is present in the original commit that introduced this driver,
although there, am65_cpsw_nuss_update_tx_rx_chns() existed as
am65_cpsw_nuss_update_tx_chns().

Fixes: 93a76530316a ("net: ethernet: ti: introduce am65x/j721e gigabit eth subsystem driver")
Signed-off-by: Roger Quadros <rogerq@...nel.org>
Reviewed-by: Simon Horman <horms@...nel.org>
Reviewed-by: Siddharth Vadapalli <s-vadapalli@...com>
---
Changes in v2:
- Fixed typo in commit log k3_udma_glue_rx_get_irq->k3_udma_glue_tx_get_irq
- Added more details to commit log
- Added Reviewed-by tags
- Link to v1: https://lore.kernel.org/r/20250114-am65-cpsw-fix-tx-irq-free-v1-1-b2069e6ed185@kernel.org
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 5465bf872734..e1de45fb18ae 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -2248,7 +2248,7 @@ static void am65_cpsw_nuss_remove_tx_chns(struct am65_cpsw_common *common)
 	for (i = 0; i < common->tx_ch_num; i++) {
 		struct am65_cpsw_tx_chn *tx_chn = &common->tx_chns[i];

-		if (tx_chn->irq)
+		if (tx_chn->irq > 0)
 			devm_free_irq(dev, tx_chn->irq, tx_chn);

 		netif_napi_del(&tx_chn->napi_tx);

---
base-commit: 5bc55a333a2f7316b58edc7573e8e893f7acb532
change-id: 20250114-am65-cpsw-fix-tx-irq-free-846ac55ee6e1

Best regards,
-- 
Roger Quadros <rogerq@...nel.org>