Re: [PATCH] platform/mellanox: mlxbf-pmc: fix sscanf() error checking

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 5/15/23 14:37, Ilpo Järvinen wrote:
> On Mon, 15 May 2023, Dan Carpenter wrote:
> 
>> The sscanf() function never returns negatives.  It returns the number of
>> items successfully read.
>>
>> Fixes: 1a218d312e65 ("platform/mellanox: mlxbf-pmc: Add Mellanox BlueField PMC driver")
>> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
>> ---
>>  drivers/platform/mellanox/mlxbf-pmc.c | 5 ++---
>>  1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/platform/mellanox/mlxbf-pmc.c b/drivers/platform/mellanox/mlxbf-pmc.c
>> index c2c9b0d3244c..be967d797c28 100644
>> --- a/drivers/platform/mellanox/mlxbf-pmc.c
>> +++ b/drivers/platform/mellanox/mlxbf-pmc.c
>> @@ -1348,9 +1348,8 @@ static int mlxbf_pmc_map_counters(struct device *dev)
>>  
>>  	for (i = 0; i < pmc->total_blocks; ++i) {
>>  		if (strstr(pmc->block_name[i], "tile")) {
>> -			ret = sscanf(pmc->block_name[i], "tile%d", &tile_num);
>> -			if (ret < 0)
>> -				return ret;
>> +			if (sscanf(pmc->block_name[i], "tile%d", &tile_num) != 1)
>> +				return -EINVAL;
>>  
>>  			if (tile_num >= pmc->tile_count)
>>  				continue;
> 
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Thank you for your patch, I've applied this patch to my fixes
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=fixes

Note it will show up in my fixes branch once I've pushed my
local branch there, which might take a while.

I will include this patch in my next fixes pull-req to Linus
for the current kernel development cycle.

Regards,

Hans