From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Stefan Baranoff <sbaranoff@gmail.com>, <dev@dpdk.org>
Cc: Jingjing Wu <jingjing.wu@intel.com>,
Beilei Xing <beilei.xing@intel.com>,
Qi Zhang <qi.z.zhang@intel.com>
Subject: Re: [dpdk-dev] i40evf: potential segfault
Date: Mon, 23 Aug 2021 08:54:55 +0100 [thread overview]
Message-ID: <8bc0d3bc-9956-d964-2ea6-2e834aa0c105@intel.com> (raw)
In-Reply-To: <CAHzKxpZOhV6sJsW7Jo-P1asKWMWVcL0KNxAwQ2YDG6cSZC9nLg@mail.gmail.com>
On 8/20/2021 7:18 PM, Stefan Baranoff wrote:
> Hi all!
>
> I was chasing a potential segfault and it appears, if I'm reading this
> driver correctly, that in i40evf_init_vf() the value vf->adapter->eth_dev
> is never set like pf->adapter->eth_dev is in eth_i40e_dev_init().
>
> I believe this is leading to a segfault when something like
> i40e_recv_scattered_pkts calls:
> dev = I40E_VSI_TO_ETH_DEV(rxq->vsi); // dev ends up NULL here
> dev->data->rx_mbuf_alloc_failed++; // this generates a NULL pointer
> dereference/segfault
>
>
> I'm not completely confident in my understanding of the PF/VF drivers so I
> may be missing something; but we are seeing the segfault on those lines in
> v20.05 at least. I couldn't find a related patch/commit but wanted to check
> if my reasoning was correct before adding this 1 line fix.
>
>
> Thanks,
> Stefan Baranoff
>
+cc maintainers.
next prev parent reply other threads:[~2021-08-23 7:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-20 18:18 Stefan Baranoff
2021-08-23 7:54 ` Ferruh Yigit [this message]
2021-08-24 2:53 ` Xing, Beilei
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