[SeaBIOS] Re: [PATCH] virtio-blk: Fix integer overflow for large max IO sizes

[Kevin O'Connor]

On Tue, Jun 06, 2023 at 03:29:52PM +0200, Lukas Stockner via SeaBIOS wrote:
> When the maximum IO size supported by the virtio-blk backend is large
> enough (>= 32MiB for 512B sectors), the computed blk_num_max will
> overflow. In particular, if it's a multiple of 32MiB, blk_num_max
> will end up as zero, causing IO requests to fail.
>
> This is triggered by e.g. the SPDK virtio-blk vhost-user backend.
>
> To fix it, just limit blk_num_max to 65535 before converting to u16.

Thanks.  I committed this change.

-Kevin