Re: [RFC PATCH] RDMA/bnxt_re: Fix OOB write in bnxt_re_copy_err_stats()

[Ding Hui]

Friendly ping.

On 2025/12/8 15:21, Ding Hui wrote:
> Recently we encountered an OOB write issue on BCM957414A4142CC with outbox
> NetXtreme-E-235.1.160.0 driver from broadcom. After a litte research,
> we found the inbox driver from upstream maybe have the same issue.
>
> The commit ef56081d1864 ("RDMA/bnxt_re: RoCE related hardware counters
> update") introduced 3 counters, and appended after BNXT_RE_OUT_OF_SEQ_ERR.
>
> However, BNXT_RE_OUT_OF_SEQ_ERR serves as a boundary marker for allocating
> hw stats with different num_counters for chip_gen_p5_p7 hardware.
>
> For BNXT_RE_NUM_STD_COUNTERS allocated hw_stats, leading to an
> out-of-bounds write in bnxt_re_copy_err_stats().
>
> It seems like that the BNXT_RE_REQ_CQE_ERROR, BNXT_RE_RESP_CQE_ERROR,
> and BNXT_RE_RESP_REMOTE_ACCESS_ERRS can be updated for generic hardware,
> not only for p5/p7 hardware.
>
> Fix this by moving them before BNXT_RE_OUT_OF_SEQ_ERR so they become
> part of the generic counter.
>
> Compile tested only.
>
> Fixes: ef56081d1864 ("RDMA/bnxt_re: RoCE related hardware counters update")
> Reported-by: Yingying Zheng <zhengyingying@xxxxxxxxxxxxxx>
> Signed-off-by: Ding Hui <dinghui@xxxxxxxxxxxxxx>
> ---
>   drivers/infiniband/hw/bnxt_re/hw_counters.h | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/infiniband/hw/bnxt_re/hw_counters.h b/drivers/infiniband/hw/bnxt_re/hw_counters.h
> index 09d371d442aa..cebec033f4a0 100644
> --- a/drivers/infiniband/hw/bnxt_re/hw_counters.h
> +++ b/drivers/infiniband/hw/bnxt_re/hw_counters.h
> @@ -89,6 +89,9 @@ enum bnxt_re_hw_stats {
>   	BNXT_RE_RES_SRQ_LOAD_ERR,
>   	BNXT_RE_RES_TX_PCI_ERR,
>   	BNXT_RE_RES_RX_PCI_ERR,
> +	BNXT_RE_REQ_CQE_ERROR,
> +	BNXT_RE_RESP_CQE_ERROR,
> +	BNXT_RE_RESP_REMOTE_ACCESS_ERRS,
>   	BNXT_RE_OUT_OF_SEQ_ERR,
>   	BNXT_RE_TX_ATOMIC_REQ,
>   	BNXT_RE_TX_READ_REQ,
> @@ -110,9 +113,6 @@ enum bnxt_re_hw_stats {
>   	BNXT_RE_TX_CNP,
>   	BNXT_RE_RX_CNP,
>   	BNXT_RE_RX_ECN,
> -	BNXT_RE_REQ_CQE_ERROR,
> -	BNXT_RE_RESP_CQE_ERROR,
> -	BNXT_RE_RESP_REMOTE_ACCESS_ERRS,
>   	BNXT_RE_NUM_EXT_COUNTERS
>   };
>   

--
Thanks,
- Ding Hui