[PATCH v1] firmware: thead: Fix buffer overflow and use standard endian macros

[Drew Fustini]

On Thu, Apr 03, 2025 at 03:10:51PM +0200, Michal Wilczynski wrote:
> Addresses two issues in the TH1520 AON firmware protocol driver:
> 
> 1. Fix a potential buffer overflow where the code used unsafe pointer
>    arithmetic to access the 'mode' field through the 'resource' pointer
>    with an offset. This was flagged by Smatch static checker as:
>    "buffer overflow 'data' 2 <= 3"
> 
> 2. Replace custom RPC_SET_BE* and RPC_GET_BE* macros with standard
>    kernel endianness conversion macros (cpu_to_be16, etc.) for better
>    portability and maintainability.
> 
> The functionality was re-tested with the GPU power-up sequence,
> confirming the GPU powers up correctly and the driver probes
> successfully.
> 
> [   12.702370] powervr ffef400000.gpu: [drm] loaded firmware
> powervr/rogue_36.52.104.182_v1.fw
> [   12.711043] powervr ffef400000.gpu: [drm] FW version v1.0 (build
> 6645434 OS)
> [   12.719787] [drm] Initialized powervr 1.0.0 for ffef400000.gpu on
> minor 0
> 
> Fixes: e4b3cbd840e5 ("firmware: thead: Add AON firmware protocol driver")
> Reported-by: Dan Carpenter <dan.carpenter at linaro.org>
> Closes: https://lore.kernel.org/all/17a0ccce-060b-4b9d-a3c4-8d5d5823b1c9@stanley.mountain/
> Signed-off-by: Michal Wilczynski <m.wilczynski at samsung.com>

Acked-by: Drew Fustini <fustini at kernel.org>

Is Ulf the person that would take this fix?

Thanks,
Drew