[igt-dev] [PATCH i-g-t v2] lib/igt_kms: Fix memory corruption

[Vignesh Raman]

Hi Daniel,

On 27/10/23 22:07, Daniel Stone wrote:
> Hi Vignesh,
> 
> On 27/10/2023 15:40, Vignesh Raman wrote:
>> In crosvm, the kernel reports 16 for count_crtcs, which exceeds
>> IGT_MAX_PIPES set to 8. The function igt_display_require allocates
>> memory for IGT_MAX_PIPES members of igt_pipe_t structures, but then
>> writes into it based on the count_crtcs reported by the kernel,
>> resulting in memory corruption.
> 
> To make this robust against future changes (32 CRTCs seems totally 
> fanciful, but so did 16 a while ago), this needs to also be robust 
> against count_crtcs exceeding IGT_NUM_PIPES, along the lines of your 
> previous change.

Yes, I agree to make the code robust against potential changes in the 
future. We can set IGT_MAX_PIPES to 32. I will send an updated patch.

Thanks.

Regards,
Vignesh