[PATCH 2/5] board: st: common: fix dfu alt buffer clearing

[Mattijs Korpershoek]

On lun., avril 14, 2025 at 14:24, Mattijs Korpershoek <mkorpershoek at kernel.org> wrote:

> Hi Vincent,
>
> Thank you for the patch.
>
> On lun., avril 07, 2025 at 19:05, Vincent Stehlé <vincent.stehle at arm.com> wrote:
>
>> The set_dfu_alt_info() function calls the ALLOC_CACHE_ALIGN_BUFFER()
>> macro to declare a `buf' variable pointer into an array allocated on the
>> stack. It then calls the memset() function to clear the useable portion
>> of the array using the idiomatic expression `sizeof(buf)'.
>>
>> While this would indeed work fine for an array, in the present case we
>> end up clearing only the size of a pointer.
>> Fix this by specifying the explicit size `DFU_ALT_BUF_LEN' instead.
>>
>> Fixes: ec2933e543df ("board: stm32mp1: move set_dfu_alt_info in st common directory")
>> Signed-off-by: Vincent Stehlé <vincent.stehle at arm.com>
>> Cc: Patrick Delaunay <patrick.delaunay at foss.st.com>
>> Cc: Patrice Chotard <patrice.chotard at foss.st.com>
>> Cc: Tom Rini <trini at konsulko.com>
>> Cc: Marek Vasut <marex at denx.de>
>
> Reviewed-by: Mattijs Korpershoek <mkorpershoek at kernel.org>

Patrice, Patrick,

This was assigned to me on patchwork. As [3-5] have been applied already
by Michal, could you please pick this up?

I've assigned it to Patrice on patchwork.

>
>> ---
>>  board/st/common/stm32mp_dfu.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/board/st/common/stm32mp_dfu.c b/board/st/common/stm32mp_dfu.c
>> index 1db8e45480e..8c1f80b678a 100644
>> --- a/board/st/common/stm32mp_dfu.c
>> +++ b/board/st/common/stm32mp_dfu.c
>> @@ -105,7 +105,7 @@ void set_dfu_alt_info(char *interface, char *devstr)
>>  	if (env_get("dfu_alt_info"))
>>  		return;
>>  
>> -	memset(buf, 0, sizeof(buf));
>> +	memset(buf, 0, DFU_ALT_BUF_LEN);
>>  
>>  	snprintf(buf, DFU_ALT_BUF_LEN,
>>  		 "ram 0=%s", CONFIG_DFU_ALT_RAM0);
>> -- 
>> 2.47.2