[PATCH v2] app/pdump: check lcore is not the maximum core

[Reshma Pattan <reshma.pattan@intel.com>]

Check lcore id value is not the maximum core supported.
Using lcore id without this check might cause
out of bound access inside the rte_eal_wait_lcore.

Coverity issue: 375841
Fixes: b2854d5317e8 ("app/pdump: support multi-core capture")
Cc: vipin.varghese@intel.com
Cc: stable@dpdk.org

Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
---
 app/pdump/main.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/app/pdump/main.c b/app/pdump/main.c
index 04a38e8911..7677a5f8f5 100644
--- a/app/pdump/main.c
+++ b/app/pdump/main.c
@@ -930,12 +930,15 @@ dump_packets(void)
 		return;
 	}
 
-	lcore_id = rte_get_next_lcore(lcore_id, 1, 0);
 
 	for (i = 0; i < num_tuples; i++) {
+		lcore_id = rte_get_next_lcore(lcore_id, 1, 0);
+		if (lcore_id == RTE_MAX_LCORE)
+			rte_exit(EXIT_FAILURE,
+				"Max core limit %u reached for packet capture", lcore_id);
+
 		rte_eal_remote_launch(dump_packets_core,
 				&pdump_t[i], lcore_id);
-		lcore_id = rte_get_next_lcore(lcore_id, 1, 0);
 
 		if (rte_eal_wait_lcore(lcore_id) < 0)
 			rte_exit(EXIT_FAILURE, "failed to wait\n");
-- 
2.27.0