Re: [Intel-wired-lan] [PATCH][net-next] ice: fix potential infinite loop

[Colin Ian King <colin.king@canonical.com>]

On 02/08/2019 18:07, Allan, Bruce W wrote:
>> -----Original Message-----
>> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@osuosl.org] On Behalf
>> Of Colin King
>> Sent: Friday, August 02, 2019 8:52 AM
>> To: Kirsher, Jeffrey T <jeffrey.t.kirsher@intel.com>; David S . Miller
>> <davem@davemloft.net>; intel-wired-lan@lists.osuosl.org;
>> netdev@vger.kernel.org
>> Cc: kernel-janitors@vger.kernel.org; linux-kernel@vger.kernel.org
>> Subject: [Intel-wired-lan] [PATCH][net-next] ice: fix potential infinite loop
>>
>> From: Colin Ian King <colin.king@canonical.com>
>>
>> The loop counter of a for-loop is a u8 however this is being compared
>> to an int upper bound and this can lead to an infinite loop if the
>> upper bound is greater than 255 since the loop counter will wrap back
>> to zero. Fix this potential issue by making the loop counter an int.
>>
>> Addresses-Coverity: ("Infinite loop")
> 
> Actually, num_alloc_vfs should probably be a u16 instead of an int since num_alloc_vfs cannot exceed 256.
> 
> Which Coverity scan reported this and what options are used in the analysis?

One that I run in a private coverity scan with scan analysis cranked up
high on linux-next, so the report is not public.

Colin

> 
>> Fixes: c7aeb4d1b9bf ("ice: Disable VFs until reset is completed")
>> Signed-off-by: Colin Ian King <colin.king@canonical.com>
>> ---
>>  drivers/net/ethernet/intel/ice/ice_main.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/intel/ice/ice_main.c
>> b/drivers/net/ethernet/intel/ice/ice_main.c
>> index c26e6a102dac..088543d50095 100644
>> --- a/drivers/net/ethernet/intel/ice/ice_main.c
>> +++ b/drivers/net/ethernet/intel/ice/ice_main.c
>> @@ -488,7 +488,7 @@ static void
>>  ice_prepare_for_reset(struct ice_pf *pf)
>>  {
>>  	struct ice_hw *hw = &pf->hw;
>> -	u8 i;
>> +	int i;
>>
>>  	/* already prepared for reset */
>>  	if (test_bit(__ICE_PREPARED_FOR_RESET, pf->state))
>> --
>> 2.20.1
>>
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