On 2024/10/15 17:03, Matti Vaittinen wrote:
> Thanks a lot Jinjie. I appreciate your fixes!
>
> On 14/10/2024 04:31, Jinjie Ruan wrote:
>> If i = 1, and per_time_scales[i] or per_time_gains[i] kcalloc fails in
>> iio_gts_build_avail_scale_table(), the err_free_out will fail to enter
>> kfree for loop because i-- is 0, and all the per_time_scales[0] and
>> per_time_gains[0] will not be freed, which will cause memory leaks.
>
> I guess the loop never frees the memory pointed by the first pointer in
> these arrays. I mean, the freeing is not working as it should even if
> the 'i' was something else but 1.
Yes, the title is not very clear. In fact, all the per_time_scales[0] or
per_time_scales[0] in the function error path are not released.
>
>>
>> Fix it by checking if i >= 0.
>
> The fix seems good to me. So, with a tiny change in commit message:
>
> Reviewed-by: Matti Vaittinen <mazziesaccount@xxxxxxxxx>
>
>>
>> Cc: stable@xxxxxxxxxxxxxxx
>> Fixes: 38416c28e168 ("iio: light: Add gain-time-scale helpers")
>> Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
>> ---
>> drivers/iio/industrialio-gts-helper.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/iio/industrialio-gts-helper.c
>> b/drivers/iio/industrialio-gts-helper.c
>> index 7326c7949244..5f131bc1a01e 100644
>> --- a/drivers/iio/industrialio-gts-helper.c
>> +++ b/drivers/iio/industrialio-gts-helper.c
>> @@ -315,7 +315,7 @@ static int iio_gts_build_avail_scale_table(struct
>> iio_gts *gts)
>> return 0;
>> err_free_out:
>> - for (i--; i; i--) {
>> + for (i--; i >= 0; i--) {
>> kfree(per_time_scales[i]);
>> kfree(per_time_gains[i]);
>> }
>
