netdev - [PATCH net v3] net: ethernet: lantiq_etop: fix double free in detach

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Message-Id: <20240708205826.5176-1-olek2@wp.pl>
Date: Mon,  8 Jul 2024 22:58:26 +0200
From: Aleksander Jan Bajkowski <olek2@...pl>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	jacob.e.keller@...el.com,
	shannon.nelson@....com,
	horms@...nel.org,
	sd@...asysnail.net,
	olek2@...pl,
	u.kleine-koenig@...gutronix.de,
	ralf@...ux-mips.org,
	ralph.hempel@...tiq.com,
	john@...ozen.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Joe Perches <joe@...ches.com>,
	Andrew Lunn <andrew@...n.ch>
Subject: [PATCH net v3] net: ethernet: lantiq_etop: fix double free in detach

The number of the currently released descriptor is never incremented
which results in the same skb being released multiple times.

Fixes: 504d4721ee8e ("MIPS: Lantiq: Add ethernet driver")
Reported-by: Joe Perches <joe@...ches.com>
Closes: https://lore.kernel.org/all/fc1bf93d92bb5b2f99c6c62745507cc22f3a7b2d.camel@perches.com/
Signed-off-by: Aleksander Jan Bajkowski <olek2@...pl>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/ethernet/lantiq_etop.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/lantiq_etop.c b/drivers/net/ethernet/lantiq_etop.c
index 5352fee62d2b..0b9982804370 100644
--- a/drivers/net/ethernet/lantiq_etop.c
+++ b/drivers/net/ethernet/lantiq_etop.c
@@ -217,9 +217,9 @@ ltq_etop_free_channel(struct net_device *dev, struct ltq_etop_chan *ch)
 	if (ch->dma.irq)
 		free_irq(ch->dma.irq, priv);
 	if (IS_RX(ch->idx)) {
-		int desc;
+		struct ltq_dma_channel *dma = &ch->dma;
 
-		for (desc = 0; desc < LTQ_DESC_NUM; desc++)
+		for (dma->desc = 0; dma->desc < LTQ_DESC_NUM; dma->desc++)
 			dev_kfree_skb_any(ch->skb[ch->dma.desc]);
 	}
 }
-- 
2.39.2