From 64c8165b44a91c09b19afb4110610ed242286639 Mon Sep 17 00:00:00 2001 From: Pablo Bitton Date: Tue, 7 Jul 2009 19:11:10 -0700 Subject: [PATCH] davinci_emac: fix kernel oops when changing MAC address while interface 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 Signed-off-by: Chaithrika U S Tested-by: Chaithrika U S [tested on DM6467 EVM] Signed-off-by: David S. Miller --- drivers/net/davinci_emac.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c index 2df8fb0..12fd446 100644 --- 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", -- 2.7.4