Re: [dpdk-dev] [PATCH] net/i40e: fix out-of-bounds writes during vector Rx

[bynes adam <adambynes@outlook.com>]

On Thu, Jul 21, 2016 at 02:03:38PM +0300, Ilya Maximets wrote:
> From: Sergey Dyasly <s.dyasly@samsung.com>
> 
> Rx loop inside _recv_raw_pkts_vec() ignores nb_pkts argument and always
> tries to receive RTE_I40E_VPMD_RX_BURST (32) packets. This is a violation
> of rte_eth_rx_burst() API and can lead to memory corruption (out-of-bounds
> writes to struct rte_mbuf **rx_pkts) if nb_pkts is less than 32.
> 
> Fix this by actually using nb_pkts inside the loop.
> 
> Fixes: 9ed94e5bb04e ("i40e: add vector Rx")
> 
> Signed-off-by: Sergey Dyasly <s.dyasly@samsung.com>
> Acked-by: Ilya Maximets <i.maximets@samsung.com>
> ---
>  drivers/net/i40e/i40e_rxtx_vec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/i40e/i40e_rxtx_vec.c b/drivers/net/i40e/i40e_rxtx_vec.c
> index 05cb415..51fb282 100644
> --- a/drivers/net/i40e/i40e_rxtx_vec.c
> +++ b/drivers/net/i40e/i40e_rxtx_vec.c
> @@ -269,7 +269,7 @@ _recv_raw_pkts_vec(struct i40e_rx_queue *rxq, struct rte_mbuf **rx_pkts,
>  	 * D. fill info. from desc to mbuf
>  	 */
>  
> -	for (pos = 0, nb_pkts_recd = 0; pos < RTE_I40E_VPMD_RX_BURST;
> +	for (pos = 0, nb_pkts_recd = 0; pos < nb_pkts;
>  			pos += RTE_I40E_DESCS_PER_LOOP,
>  			rxdp += RTE_I40E_DESCS_PER_LOOP) {
>  		__m128i descs[RTE_I40E_DESCS_PER_LOOP];
> -- 
> 2.7.4
 Acked-by: Adam Bynes <adambynes@outlook.com>