On 8/16/24 15:42, Yu Kuai wrote:
> 在 2024/08/16 11:58, Zheng Qixing 写道:
>> In ata_host_alloc(), if ata_port_alloc(host) fails to allocate memory
>> for a port, the allocated 'host' structure is not freed before returning
>> from the function. This results in a potential memory leak.
>>
>> This patch adds a kfree(host) before the error handling code is executed
>> to ensure that the 'host' structure is properly freed in case of an
>> allocation failure.
>>
>> Signed-off-by: Zheng Qixing <zhengqixing@xxxxxxxxxx>
I did not receive this patch and I do not see it on the list either. Something
went wrong...
Can you resend please ? Thanks.
>> ---
>> drivers/ata/libata-core.c | 4 +++-
>> 1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
>> index e4023fc288ac..f27a18990c38 100644
>> --- a/drivers/ata/libata-core.c
>> +++ b/drivers/ata/libata-core.c
>> @@ -5663,8 +5663,10 @@ struct ata_host *ata_host_alloc(struct device *dev, int n_ports)
>> }
>>
>> dr = devres_alloc(ata_devres_release, 0, GFP_KERNEL);
>> - if (!dr)
>> + if (!dr) {
>> + kfree(host);
>> goto err_out;
>> + }
>
> Looks correct, dev_set_drvdata(dev, host) is not called yet.
> ata_devres_release won't free host in this case.
>
> I'll suggest to return NULL directly here, and then the 'err_out'
> tag can be removed as well.
I do not think so. Since devres_open_group() was called, need to call either
devres_remove_group() or devres_release_group().
>
> Anyway, with or without the cleanup:
> Reviewed-by: Yu Kuai <yukuai3@xxxxxxxxxx>>
> Thanks!
>>
>> devres_add(dev, dr);
>> dev_set_drvdata(dev, host);
>>
>
--
Damien Le Moal
Western Digital Research
