Re: [PATCH] mtd: cfi_cmdset_0002: don't free cfi->cfiq in error path of cfi_amdstd_setup()

[Hou Tao <houtao1@huawei.com>]

Hi,

On 2019/10/16 13:38, Vignesh Raghavendra wrote:
> Hi Hou,
> 
> On 16/10/19 1:17 AM, Richard Weinberger wrote:
>> On Tue, Oct 8, 2019 at 4:29 AM Hou Tao <houtao1@huawei.com> wrote:
>>>
>>> Else there may be a double-free problem, because cfi->cfiq will
>>> be freed by mtd_do_chip_probe() if both the two invocations of
>>> check_cmd_set() return failure.
>>>
>>> Also check cfi_intelext_setup() & cfi_staa_setup() to find out
>>> that cfi->cfiq is not freed as well in these functions.
>>
> 
> I guess you are trying to imply cfi_amdstd_setup() equivalents in
> cfi_cmdset_0001.c (cfi_intelext_setup()) and cfi_cmdset_0020.c
> (cfi_staa_setup()) dont't call kfree(cfi->cfiq). So cfi_amdstd_setup()
> should not be freeing that pointer either?
> 
No. The lines are used to illustrate the same mistake doesn't happen
in cfi_cmdset_0001 & 0020 instead of cfi_cmdstd_setup() needs to do
the same thing as others cmdset.

> This reference to other drivers in commit msg is quite confusing. My
> suggestion would be to drop above line.
>
It's OK for me if you drop these line.

> Let me know if that sound good. I will drop the it while applying.
> 
> 
Regards,
Tao

>> This sentence does not make sense to me.
>>
>>> Signed-off-by: Hou Tao <houtao1@huawei.com>
>>> ---
>>>  drivers/mtd/chips/cfi_cmdset_0002.c | 1 -
>>>  1 file changed, 1 deletion(-)
>>>
>>> diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
>>> index cf8c8be40a9c..7eaa4b523197 100644
>>> --- a/drivers/mtd/chips/cfi_cmdset_0002.c
>>> +++ b/drivers/mtd/chips/cfi_cmdset_0002.c
>>> @@ -785,7 +785,6 @@ static struct mtd_info *cfi_amdstd_setup(struct mtd_info *mtd)
>>>         kfree(mtd->eraseregions);
>>>         kfree(mtd);
>>>         kfree(cfi->cmdset_priv);
>>> -       kfree(cfi->cfiq);
>>>         return NULL;
>>>  }
>>
>> Other than that,
>> Reviewed-by: Richard Weinberger <richard@nod.at>
>>
> 


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/