Re: [PATCH] accel/ivpu: Add bounds checks for firmware log indices

["Wachowski, Karol" <karol.wachowski@linux.intel.com>]

On 29-May-26 14:06, Wachowski, Karol wrote:
> On 29-May-26 13:58, Andrzej Kacprowski wrote:
>> Add validation that read and write indices in the firmware log buffer
>> are within valid bounds (< data_size) before using them. If
>> out-of-bounds indices are encountered (from firmware), clamp them to
>> safe values instead of proceeding with invalid offsets.
>>
>> This prevents potential out-of-bounds buffer access when firmware
>> supplies invalid log indices.
>>
>> Fixes: 1fc1251149a7 ("accel/ivpu: Refactor functions in ivpu_fw_log.c")
>> Cc: <stable@vger.kernel.org> # v6.18+
>> Signed-off-by: Andrzej Kacprowski <andrzej.kacprowski@linux.intel.com>
> 
> Reviewed-by: Karol Wachowski <karol.wachowski@linux.intel.com>
> 

Applied to drm-misc-fixes.

>> ---
>>   drivers/accel/ivpu/ivpu_fw_log.c | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/accel/ivpu/ivpu_fw_log.c b/drivers/accel/ivpu/ 
>> ivpu_fw_log.c
>> index 337c906b0210..275baf844b56 100644
>> --- a/drivers/accel/ivpu/ivpu_fw_log.c
>> +++ b/drivers/accel/ivpu/ivpu_fw_log.c
>> @@ -98,6 +98,11 @@ static void fw_log_print_buffer(struct 
>> vpu_tracing_buffer_header *log, const cha
>>       u32 log_start = only_new_msgs ? READ_ONCE(log->read_index) : 0;
>>       u32 log_end = READ_ONCE(log->write_index);
>> +    if (log_start >= data_size)
>> +        log_start = 0;
>> +    if (log_end > data_size)
>> +        log_end = data_size;
>> +
>>       if (log->wrap_count == log->read_wrap_count) {
>>           if (log_end <= log_start) {
>>               drm_printf(p, "==== %s \"%s\" log empty ====\n", prefix, 
>> log->name);
> 
>