netdev - [PATCH net] rtase: Fix improper release of ring list entries in rtase_sw

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Message-ID: <20250306070510.18129-1-justinlai0215@realtek.com>
Date: Thu, 6 Mar 2025 15:05:10 +0800
From: Justin Lai <justinlai0215@...ltek.com>
To: <kuba@...nel.org>
CC: <davem@...emloft.net>, <edumazet@...gle.com>, <pabeni@...hat.com>,
        <andrew+netdev@...n.ch>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>, <horms@...nel.org>, <pkshih@...ltek.com>,
        <larry.chiu@...ltek.com>, Justin Lai <justinlai0215@...ltek.com>
Subject: [PATCH net] rtase: Fix improper release of ring list entries in rtase_sw_reset

Since rtase_init_ring, which is called within rtase_sw_reset, adds ring
entries already present in the ring list back into the list, it causes
the ring list to form a cycle. This results in list_for_each_entry_safe
failing to find an endpoint during traversal, leading to an error.
Therefore, it is necessary to remove the previously added ring_list nodes
before calling rtase_init_ring.

Fixes: 079600489960 ("rtase: Implement net_device_ops")
Signed-off-by: Justin Lai <justinlai0215@...ltek.com>
---
 drivers/net/ethernet/realtek/rtase/rtase_main.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index 3bd11cb56294..2aacc1996796 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -1501,7 +1501,10 @@ static void rtase_wait_for_quiescence(const struct net_device *dev)
 static void rtase_sw_reset(struct net_device *dev)
 {
 	struct rtase_private *tp = netdev_priv(dev);
+	struct rtase_ring *ring, *tmp;
+	struct rtase_int_vector *ivec;
 	int ret;
+	u32 i;
 
 	netif_stop_queue(dev);
 	netif_carrier_off(dev);
@@ -1512,6 +1515,13 @@ static void rtase_sw_reset(struct net_device *dev)
 	rtase_tx_clear(tp);
 	rtase_rx_clear(tp);
 
+	for (i = 0; i < tp->int_nums; i++) {
+		ivec = &tp->int_vector[i];
+		list_for_each_entry_safe(ring, tmp, &ivec->ring_list,
+					 ring_entry)
+			list_del(&ring->ring_entry);
+	}
+
 	ret = rtase_init_ring(dev);
 	if (ret) {
 		netdev_err(dev, "unable to init ring\n");
-- 
2.34.1