From c70d68150f71b84cea6997a53493e17bf18a54db Mon Sep 17 00:00:00 2001 From: Bert Kenward Date: Wed, 12 Jul 2017 17:19:41 +0100 Subject: [PATCH] sfc: don't read beyond unicast address list If we have more than 32 unicast MAC addresses assigned to an interface we will read beyond the end of the address table in the driver when adding filters. The next 256 entries store multicast addresses, so we will end up attempting to insert duplicate filters, which is mostly harmless. If we add more than 288 unicast addresses we will then read past the multicast address table, which is likely to be more exciting. Fixes: 12fb0da45c9a ("sfc: clean fallbacks between promisc/normal in efx_ef10_filter_sync_rx_mode") Signed-off-by: Bert Kenward Signed-off-by: David S. Miller --- drivers/net/ethernet/sfc/ef10.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c index 761c518b2f92..13f72f5b18d2 100644 --- a/drivers/net/ethernet/sfc/ef10.c +++ b/drivers/net/ethernet/sfc/ef10.c @@ -5034,12 +5034,9 @@ static void efx_ef10_filter_uc_addr_list(struct efx_nic *efx) struct efx_ef10_filter_table *table = efx->filter_state; struct net_device *net_dev = efx->net_dev; struct netdev_hw_addr *uc; - int addr_count; unsigned int i; - addr_count = netdev_uc_count(net_dev); table->uc_promisc = !!(net_dev->flags & IFF_PROMISC); - table->dev_uc_count = 1 + addr_count; ether_addr_copy(table->dev_uc_list[0].addr, net_dev->dev_addr); i = 1; netdev_for_each_uc_addr(uc, net_dev) { @@ -5050,6 +5047,8 @@ static void efx_ef10_filter_uc_addr_list(struct efx_nic *efx) ether_addr_copy(table->dev_uc_list[i].addr, uc->addr); i++; } + + table->dev_uc_count = i; } static void efx_ef10_filter_mc_addr_list(struct efx_nic *efx) @@ -5057,12 +5056,11 @@ static void efx_ef10_filter_mc_addr_list(struct efx_nic *efx) struct efx_ef10_filter_table *table = efx->filter_state; struct net_device *net_dev = efx->net_dev; struct netdev_hw_addr *mc; - unsigned int i, addr_count; + unsigned int i; table->mc_overflow = false; table->mc_promisc = !!(net_dev->flags & (IFF_PROMISC | IFF_ALLMULTI)); - addr_count = netdev_mc_count(net_dev); i = 0; netdev_for_each_mc_addr(mc, net_dev) { if (i >= EFX_EF10_FILTER_DEV_MC_MAX) { -- 2.39.2