[PATCH v2] USB: Fix NULLPTR dereference when serial# is unset

[Mattijs Korpershoek]

Hi Heiko,

On mar., janv. 28, 2025 at 10:17, Heiko Schocher <hs at denx.de> wrote:

> Hello Mattijs,
>
> On 28.01.25 10:11, Mattijs Korpershoek wrote:
>> Hi Michael,
>> 
>> Thank you for the patch.
>> 
>> On mar., janv. 28, 2025 at 02:49, Marek Vasut <marex at denx.de> wrote:
>> 
>>> On 1/28/25 1:30 AM, Michael Ferolito wrote:
>>>> The current behaviour of this function will dereference a null pointer
>>>> if the serial# environment variable is unset. This was discovered on a
>>>> board where U-Boot did not have access to the first 256MB of ram,
>>>> resulting in a board crash.
>>>> In the event that U-Boot has full access to memory, it will still read
>>>> from address 0, which is probably not optimal.
>>>> This simple check is enough to fix it
>>>>
>>>> Signed-off-by: Michael Ferolito <michaelsunn101 at gmail.com>
>>>> Cc: Marek Vasut <marex at denx.de>
>>>> Cc: Heiko Schocher <hs at denx.de>
>>>> Cc: Kyungmin Park <kyungmin.park at samsung.com>
>>> The subject tag is "usb: gadget: g_dnl:" instead of "USB:" , with that
>>> fixed:
>>>
>>> Reviewed-by: Marek Vasut <marex at denx.de>
>> 
>> Agreed with Marek on this. Please add:
>> 
>> Reviewed-by: Mattijs Korpershoek <mkorpershoek at baylibre.com>
>> 
>> As well.
>> 
>> Marek, since this is gadget, can this go through my tree?
>> In that case, Michael, I can fix up the subject when applying (to avoid
>> you sending a v2)
>
> There is already a v4, see:
>
> https://lists.denx.de/pipermail/u-boot/2025-January/578746.html

Indeed. Seems I'm a bit slow today :)

Thanks for sharing the link.

>
> bye,
> Heiko
> -- 
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