linux-kernel - Re: [PATCH] net: netxen: report error on version offset reading

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Date:   Thu, 30 Mar 2023 09:01:35 +0300
From:   Denis Plotnikov <den-plotnikov@...dex-team.ru>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     GR-Linux-NIC-Dev@...vell.com, manishc@...vell.com,
        rahulv@...vell.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Subject: Re: [PATCH] net: netxen: report error on version offset reading


On 29.03.2023 21:59, Leon Romanovsky wrote:
> On Wed, Mar 29, 2023 at 07:26:29PM +0300, Denis Plotnikov wrote:
>> A static analyzer complains for non-checking the function returning value.
>> Although, the code looks like not expecting any problems with version
>> reading on netxen_p3_has_mn call, it seems the error still may happen.
>> So, at least, add error reporting to ease problems investigation.
>>
>> Signed-off-by: Denis Plotnikov <den-plotnikov@...dex-team.ru>
>> ---
>>   drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c | 9 +++++++--
>>   1 file changed, 7 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
>> index 35ec9aab3dc7b..92962dbb73ad0 100644
>> --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
>> +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
>> @@ -1192,8 +1192,13 @@ netxen_p3_has_mn(struct netxen_adapter *adapter)
>>   	if (NX_IS_REVISION_P2(adapter->ahw.revision_id))
>>   		return 1;
>>   
>> -	netxen_rom_fast_read(adapter,
>> -			NX_FW_VERSION_OFFSET, (int *)&flashed_ver);
>> +	if (netxen_rom_fast_read(adapter,
>> +			NX_FW_VERSION_OFFSET, (int *)&flashed_ver)) {
> 1. Mo callers of netxen_rom_fast_read() print debug messages, so this
> shouldn't too.
> 2. netxen_p3_has_mn() can't fail and by returning 0, you will cause to
> unpredictable behaviour in netxen_validate_firmware().
>
> Thanks

Well, ok. Then patch isn't needed.

Thanks for reviewing!


Denis

>
>> +		printk(KERN_ERR "%s: ERROR on flashed version reading",
>> +				netxen_nic_driver_name);
>> +		return 0;
>> +	}
>> +
>>   	flashed_ver = NETXEN_DECODE_VERSION(flashed_ver);
>>   
>>   	if (flashed_ver >= NETXEN_VERSION_CODE(4, 0, 220)) {
>> -- 
>> 2.25.1
>>