linux-kernel - Re: [RFC PATCH] RDMA/bnxt_re: Fix OOB write in bnxt_re_copy_err

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Message-ID: <20251221080059.GB13030@unreal>
Date: Sun, 21 Dec 2025 10:00:59 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Ding Hui <dinghui@...gfor.com.cn>, selvin.xavier@...adcom.com,
	kalesh-anakkur.purayil@...adcom.com,
	saravanan.vajravel@...adcom.com, vasuthevan.maheswaran@...adcom.com
Cc: linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	zhengyingying@...gfor.com.cn, jgg@...pe.ca
Subject: Re: [RFC PATCH] RDMA/bnxt_re: Fix OOB write in
 bnxt_re_copy_err_stats()

On Thu, Dec 18, 2025 at 10:16:02AM +0800, Ding Hui wrote:
> Friendly ping.

I'm waiting for some sort of response from Broadcom people.

Thanks

> 
> 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@...gfor.com.cn>
> > Signed-off-by: Ding Hui <dinghui@...gfor.com.cn>
> > ---
> >   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
> 
>