[PATCH net 03/12] net: systemport: Fix NULL pointer dereference in bcm_sysport_fini_rx_ring()

[Florian Fainelli <florian.fainelli@broadcom.com>]

If allocation of priv->rx_cbs fails during bcm_sysport_init_rx_ring(),
error unwinding in bcm_sysport_open() calls bcm_sysport_fini_rx_ring().
Without checking if priv->rx_cbs is non-NULL, bcm_sysport_fini_rx_ring()
dereferences priv->rx_cbs, resulting in a NULL pointer dereference.

Add a check for !priv->rx_cbs at the beginning of
bcm_sysport_fini_rx_ring(), matching bcm_sysport_fini_tx_ring().

Fixes: 80105befdb4b ("net: systemport: add Broadcom SYSTEMPORT Ethernet MAC driver")
Assisted-by: LLM
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
---
 drivers/net/ethernet/broadcom/bcmsysport.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
index 8328fe824d15..b91a57540f55 100644
--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -1717,6 +1717,9 @@ static void bcm_sysport_fini_rx_ring(struct bcm_sysport_priv *priv)
 	if (!(reg & RDMA_DISABLED))
 		netdev_warn(priv->netdev, "RDMA not stopped!\n");
 
+	if (!priv->rx_cbs)
+		return;
+
 	for (i = 0; i < priv->num_rx_bds; i++) {
 		cb = &priv->rx_cbs[i];
 		if (dma_unmap_addr(cb, dma_addr))
-- 
2.34.1