Re: [PATCH 08/12] block/nvme: nvme_process_completion() fix bound for cid

[Peter Maydell]

On Mon, 25 Sept 2023 at 20:42, Vladimir Sementsov-Ogievskiy
<vsementsov@yandex-team.ru> wrote:
>
> NVMeQueuePair::reqs as length NVME_NUM_REQS, which less than
> NVME_QUEUE_SIZE by 1.
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
> ---
>  block/nvme.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/block/nvme.c b/block/nvme.c
> index b6e95f0b7e..7f11ce1d46 100644
> --- a/block/nvme.c
> +++ b/block/nvme.c
> @@ -416,9 +416,9 @@ static bool nvme_process_completion(NVMeQueuePair *q)
>              q->cq_phase = !q->cq_phase;
>          }
>          cid = le16_to_cpu(c->cid);
> -        if (cid == 0 || cid > NVME_QUEUE_SIZE) {
> -            warn_report("NVMe: Unexpected CID in completion queue: 
> %"PRIu32", "
> -                        "queue size: %u", cid, NVME_QUEUE_SIZE);
> +        if (cid == 0 || cid > NVME_NUM_REQS) {
> +            warn_report("NVMe: Unexpected CID in completion queue: %" PRIu32
> +                        ", should be within is: 1..%u", cid, NVME_NUM_REQS);
>              continue;
>          }
>          trace_nvme_complete_command(s, q->index, cid);

A slightly different patch for this one was sent to the list back in 2020 but
apparently fell through the cracks:

https://patchew.org/QEMU/20201208144452.91172-1-alex.chen@huawei.com/

-- PMM