[dpdk-dev] [PATCH] net/mlx5: fix a segmentation fault in Rx

[Nelio Laranjeiro <nelio.laranjeiro@6wind.com>]

Fixed issue could occur when a Mbuf starvation happens in a middle of
reception of a segmented packet, in such situation, the PMD has to release
all segments of such packet.  The end condition was wrong causing it to
free a Mbuf still handled by the NIC.

Fixes: 9964b965ad69 ("net/mlx5: re-add Rx scatter support")

Reported-by: Yongseok Koh <yskoh@mellanox.com>
Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
---
 drivers/net/mlx5/mlx5_rxtx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index 0c352f3..3564937 100644
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -1572,7 +1572,8 @@ mlx5_rx_burst(void *dpdk_rxq, struct rte_mbuf **pkts, uint16_t pkts_n)
 		rte_prefetch0(wqe);
 		rep = rte_mbuf_raw_alloc(rxq->mp);
 		if (unlikely(rep == NULL)) {
-			while (pkt) {
+			while (pkt != seg) {
+				assert(pkt != (*rxq->elts)[idx]);
 				seg = NEXT(pkt);
 				rte_mbuf_refcnt_set(pkt, 0);
 				__rte_mbuf_raw_free(pkt);
-- 
2.1.4