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sfc: don't read beyond unicast address list

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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: 12fb0da45c ("sfc: clean fallbacks between promisc/normal in efx_ef10_filter_sync_rx_mode")
Signed-off-by: Bert Kenward <bkenward@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bert Kenward 2017-07-12 17:19:41 +01:00 committed by David S. Miller
parent 07b8a7cf9a
commit c70d68150f
1 changed files with 3 additions and 5 deletions
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8
drivers/net/ethernet/sfc/ef10.c
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@ -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) {