[PATCH v2] android_ab: don't ignore ab_control_store return code

[Mattijs Korpershoek]

Hi Alexey,

On Tue, Jan 09, 2024 at 10:37, Alexey Romanov <avromanov at salutedevices.com> wrote:

> + Tom Rini
>
> Hello! Please, ping

It seems that Igor (the Android AB maintainer) has been busy elsewhere.

I've requested to take over maintainership:
https://lore.kernel.org/all/20240112-maintainers-ab-v1-0-f2a538eab18a@baylibre.com/

If that gets accepted, I will pick up this patch.

Thank you for your patience,

Mattijs

>
> On Mon, Dec 25, 2023 at 01:22:45PM +0300, Alexey Romanov wrote:
>> ab_control_store() can return an error if writing to disk fails.
>> In this case, we have to pass the error code to the caller.
>> 
>> Signed-off-by: Alexey Romanov <avromanov at salutedevices.com>
>> Reviewed-by: Mattijs Korpershoek <mkorpershoek at baylibre.com>
>> ---
>>  boot/android_ab.c | 16 ++++++++++++++--
>>  1 file changed, 14 insertions(+), 2 deletions(-)
>> 
>> diff --git a/boot/android_ab.c b/boot/android_ab.c
>> index 73b55c196c..af3c375e07 100644
>> --- a/boot/android_ab.c
>> +++ b/boot/android_ab.c
>> @@ -337,7 +337,14 @@ int ab_select_slot(struct blk_desc *dev_desc, struct disk_partition *part_info,
>>  
>>  	if (store_needed) {
>>  		abc->crc32_le = ab_control_compute_crc(abc);
>> -		ab_control_store(dev_desc, part_info, abc, 0);
>> +		ret = ab_control_store(dev_desc, part_info, abc, 0);
>> +		if (ret < 0) {
>> +#if ANDROID_AB_BACKUP_OFFSET
>> +			free(backup_abc);
>> +#endif
>> +			free(abc);
>> +			return ret;
>> +		}
>>  	}
>>  
>>  #if ANDROID_AB_BACKUP_OFFSET
>> @@ -346,8 +353,13 @@ int ab_select_slot(struct blk_desc *dev_desc, struct disk_partition *part_info,
>>  	 * to the backup offset
>>  	 */
>>  	if (memcmp(backup_abc, abc, sizeof(*abc)) != 0) {
>> -		ab_control_store(dev_desc, part_info, abc,
>> +		ret = ab_control_store(dev_desc, part_info, abc,
>>  				 ANDROID_AB_BACKUP_OFFSET);
>> +		if (ret < 0) {
>> +			free(backup_abc);
>> +			free(abc);
>> +			return ret;
>> +		}
>>  	}
>>  	free(backup_abc);
>>  #endif
>> -- 
>> 2.39.2
>> 
>
> -- 
> Thank you,
> Alexey