Re: [patch net-next] sfc: a couple off by one bugs

Colin Ian King
2017-02-01T13:34:49Z

On 01/02/17 13:24, Edward Cree wrote:
> On 01/02/17 08:50, Dan Carpenter wrote:
>> These checks are off by one. These are just sanity checks and we don't
>> ever pass invalid values for "encap_type" so it's harmless.
>>
>> Fixes: 9b4108012517 ("sfc: insert catch-all filters for encapsulated traffic")
>> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> One of these was already fixed by Colin Ian King in
> e9904990e8e70a51574e6ec6b872f3c705ec75f0 ("sfc: fix an off-by-one compare on an
> array size").

Ugh, I missed one of those.

> For the other one:
> Acked-by: Edward Cree <ecree@solarflare.com>
>> diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c
>> index 8bec9383d754..dec0c8083ff3 100644
>> --- a/drivers/net/ethernet/sfc/ef10.c
>> +++ b/drivers/net/ethernet/sfc/ef10.c
>> @@ -5080,7 +5080,7 @@ static int efx_ef10_filter_insert_def(struct efx_nic *efx,
>>
>> /* quick bounds check (BCAST result impossible) */
>> BUILD_BUG_ON(EFX_EF10_BCAST != 0);
>> - if (encap_type > ARRAY_SIZE(map) || map[encap_type] = 0) {
>> + if (encap_type >= ARRAY_SIZE(map) || map[encap_type] = 0) {
>> WARN_ON(1);
>> return -EINVAL;
>> }
>> @@ -5134,7 +5134,7 @@ static int efx_ef10_filter_insert_def(struct efx_nic *efx,
>>
>> /* quick bounds check (BCAST result impossible) */
>> BUILD_BUG_ON(EFX_EF10_BCAST != 0);
>> - if (encap_type > ARRAY_SIZE(map) || map[encap_type] = 0) {
>> + if (encap_type >= ARRAY_SIZE(map) || map[encap_type] = 0) {
>> WARN_ON(1);
>> return -EINVAL;
>> }
>
>
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