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From: Somnath Kotur <somnath.kotur@broadcom.com>
To: yuanlinsi01 <yuanlinsi01@baidu.com>,
	Lance Richardson <lance.richardson@broadcom.com>
Cc: Ajit Kumar Khaparde <ajit.khaparde@broadcom.com>, dev <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] net/bnxt: fix a possible stack smashing
Date: Thu, 30 Apr 2020 18:25:38 +0530
Message-ID: <CAOBf=mttGX5ADtnJ5vDUZ1knseLKLi2LC0msLMA_5cnCN9_vjQ@mail.gmail.com> (raw)
In-Reply-To: <1588248312-7410-1-git-send-email-yuanlinsi01@baidu.com>

+Lance Richardson

Thanks for the patch, could you please add the 'Fixes' tag as well ?



On Thu, Apr 30, 2020 at 5:35 PM yuanlinsi01 <yuanlinsi01@baidu.com> wrote:
>
> We see a stack smashing as a result of defensive code missing. Once the
> nb_pkts is less than RTE_BNXT_DESCS_PER_LOOP, it will be modified to
> zero after doing a floor align, and we can not exit the following
> receiving packets loop. And the buffers will be overwrite, then the
> stack frame was ruined.
>
> Fix the problem by adding defensive code, once the nb_pkts is zero, just
> directly return with no packets.
>
> Signed-off-by: yuanlinsi01 <yuanlinsi01@baidu.com>
> Signed-off-by: rongdongsheng <rongdongsheng@baidu.com>
> ---
>  drivers/net/bnxt/bnxt_rxtx_vec_sse.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/bnxt/bnxt_rxtx_vec_sse.c b/drivers/net/bnxt/bnxt_rxtx_vec_sse.c
> index d0e7910e7..c4adccdbc 100644
> --- a/drivers/net/bnxt/bnxt_rxtx_vec_sse.c
> +++ b/drivers/net/bnxt/bnxt_rxtx_vec_sse.c
> @@ -233,8 +233,13 @@ bnxt_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
>         /* Return no more than RTE_BNXT_MAX_RX_BURST per call. */
>         nb_pkts = RTE_MIN(nb_pkts, RTE_BNXT_MAX_RX_BURST);
>
> -       /* Make nb_pkts an integer multiple of RTE_BNXT_DESCS_PER_LOOP */
> +       /*
> +        * Make nb_pkts an integer multiple of RTE_BNXT_DESCS_PER_LOOP
> +        * nb_pkts < RTE_BNXT_DESCS_PER_LOOP, just return no packet
> +        */
>         nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_BNXT_DESCS_PER_LOOP);
> +       if (!nb_pkts)
> +               return 0;
>
>         /* Handle RX burst request */
>         while (1) {
> --
> 2.11.0
>

  reply	other threads:[~2020-04-30 12:55 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-30 12:05 yuanlinsi01
2020-04-30 12:55 ` Somnath Kotur [this message]
2020-04-30 13:33   ` [dpdk-dev] 答复: " Yuan,Linsi
  -- strict thread matches above, loose matches on Subject: below --
2020-05-06  3:28 [dpdk-dev] " Yuan Linsi
2020-05-06  5:26 ` Ajit Khaparde
2020-05-06  3:18 Yuan Linsi
2020-04-30 13:37 Yuan Linsi
2020-04-30 13:45 ` Lance Richardson
2020-04-30 18:29   ` Ajit Khaparde
2020-04-30 23:55 ` Ferruh Yigit
2020-05-05  3:42   ` Ajit Khaparde
2020-05-06  3:18     ` [dpdk-dev] 答复: " Yuan,Linsi
2020-04-30 10:08 [dpdk-dev] " yuanlinsi01
2020-04-30 10:07 yuanlinsi01

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