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

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Message-ID: <20251222085627.GB13529@unreal>
Date: Mon, 22 Dec 2025 10:56:27 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Ding Hui <dinghui@...gfor.com.cn>
Cc: Kalesh Anakkur Purayil <kalesh-anakkur.purayil@...adcom.com>,
	selvin.xavier@...adcom.com, jgg@...pe.ca,
	saravanan.vajravel@...adcom.com, vasuthevan.maheswaran@...adcom.com,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	zhengyingying@...gfor.com.cn
Subject: Re: [RFC PATCH] RDMA/bnxt_re: Fix OOB write in
 bnxt_re_copy_err_stats()

On Mon, Dec 22, 2025 at 02:33:59PM +0800, Ding Hui wrote:
> On 2025/12/21 23:47, Kalesh Anakkur Purayil wrote:
> > On Mon, Dec 8, 2025 at 12:52 PM Ding Hui <dinghui@...gfor.com.cn> 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>
> > 
> > Thank you Ding, the fix looks good to me and I have verified it locally.
> > 
> 
> Thanks for confirming.
> 
> Do I need to resend the patch without RFC prefix and update some commit log,
> such as getting rid of the first paragraph about the outbox driver?

No, there is no need. I'll fix it locally.

Thanks

> 
> > Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@...adcom.com>
> > Tested-by: Kalesh AP <kalesh-anakkur.purayil@...adcom.com>
> > 
> 
> -- 
> Thanks,
> - Ding Hui
>