davinci_emac: fix kernel oops when changing MAC address while interfa…

…ce is down Check that network interface is running before changing its MAC address. Otherwise, rxch is accessed when it's NULL - causing a kernel oops. Moreover, check that the new MAC address is valid. Signed-off-by: Pablo Bitton <[email protected]> Signed-off-by: Chaithrika U S <[email protected]> Tested-by: Chaithrika U S <[email protected]> [tested on DM6467 EVM] Signed-off-by: David S. Miller <[email protected]>
rtvt123 · Jul 8, 2009 · 64c8165 · 64c8165
1 parent 19e588e
commit 64c8165
Showing 1 changed file with 10 additions and 2 deletions.
diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
@@ -1820,11 +1820,19 @@ static int emac_dev_setmac_addr(struct net_device *ndev, void *addr)
 	struct device *emac_dev = &priv->ndev->dev;
 	struct sockaddr *sa = addr;
 
+	if (!is_valid_ether_addr(sa->sa_data))
+		return -EINVAL;
+
 	/* Store mac addr in priv and rx channel and set it in EMAC hw */
 	memcpy(priv->mac_addr, sa->sa_data, ndev->addr_len);
-	memcpy(rxch->mac_addr, sa->sa_data, ndev->addr_len);
 	memcpy(ndev->dev_addr, sa->sa_data, ndev->addr_len);
-	emac_setmac(priv, EMAC_DEF_RX_CH, rxch->mac_addr);
+
+	/* If the interface is down - rxch is NULL. */
+	/* MAC address is configured only after the interface is enabled. */
+	if (netif_running(ndev)) {
+		memcpy(rxch->mac_addr, sa->sa_data, ndev->addr_len);
+		emac_setmac(priv, EMAC_DEF_RX_CH, rxch->mac_addr);
+	}
 
 	if (netif_msg_drv(priv))
 		dev_notice(emac_dev, "DaVinci EMAC: emac_dev_setmac_addr %pM\n",