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

[Ilya Maximets <i.maximets@samsung.com>]

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