Re: [dpdk-dev] net/i40e: fix integer overflow

["Zhang, Xiao" <xiao.zhang@intel.com>]

Hi Kevin,

Will update the patch according to your comments. Thanks.

Xiao

> -----Original Message-----
> From: Kevin Traynor [mailto:ktraynor@redhat.com]
> Sent: Monday, October 14, 2019 6:36 PM
> To: Zhang, Xiao <xiao.zhang@intel.com>; dev@dpdk.org
> Cc: Xing, Beilei <beilei.xing@intel.com>; Zhang, Qi Z <qi.z.zhang@intel.com>;
> stable@dpdk.org
> Subject: Re: [dpdk-dev] net/i40e: fix integer overflow
> 
> On 14/10/2019 09:33, Xiao Zhang wrote:
> > When configuring i40e rx queue, the temporary variable to store max
> > packet length is not big enough which leads to integer overflow issue.
> > This patch is to fix the issue by changing the variable type from
> > uint16_t to uint32_t.
> >
> > Fixes: c511a96a34d7 ("mbuf: add accessors for data room and private
> > size")
> 
> It should be
> Fixes: 4861cde46116 ("i40e: new poll mode driver")
> 
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Xiao Zhang <xiao.zhang@intel.com>
> > ---
> >  drivers/net/i40e/i40e_rxtx.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/i40e/i40e_rxtx.c
> > b/drivers/net/i40e/i40e_rxtx.c index bfe161f..ca15b12 100644
> > --- a/drivers/net/i40e/i40e_rxtx.c
> > +++ b/drivers/net/i40e/i40e_rxtx.c
> > @@ -2596,7 +2596,8 @@ i40e_rx_queue_config(struct i40e_rx_queue *rxq)
> >  	struct i40e_pf *pf = I40E_VSI_TO_PF(rxq->vsi);
> >  	struct i40e_hw *hw = I40E_VSI_TO_HW(rxq->vsi);
> >  	struct rte_eth_dev_data *data = pf->dev_data;
> > -	uint16_t buf_size, len;
> > +	uint16_t buf_size;
> > +	uint32_t len;
> >
> 
> You can just remove the variable, it's only used once.
> 
> >  	buf_size = (uint16_t)(rte_pktmbuf_data_room_size(rxq->mp) -
> >  		RTE_PKTMBUF_HEADROOM);
> >