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

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Message-ID: <CAH-L+nN=qLmtHSJ87TXWJHWTts5NrtO=TapGm1wysYfWw50zvA@mail.gmail.com>
Date: Sun, 21 Dec 2025 16:48:32 +0530
From: Kalesh Anakkur Purayil <kalesh-anakkur.purayil@...adcom.com>
To: Leon Romanovsky <leon@...nel.org>
Cc: Ding Hui <dinghui@...gfor.com.cn>, selvin.xavier@...adcom.com, 
	saravanan.vajravel@...adcom.com, vasuthevan.maheswaran@...adcom.com, 
	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()

Hi Ding/Leon,

We will validate the changes on BCM957414A4142CC and confirm.

On Sun, Dec 21, 2025 at 1:31 PM Leon Romanovsky <leon@...nel.org> wrote:
>
> 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
> >
> >



-- 
Regards,
Kalesh AP

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