[dpdk-dev] [PATCH] net/tap: ipc add check for number of messages received

[Herakliusz Lipiec <herakliusz.lipiec@intel.com>]

A sucessfull call to rte_mp_request_sync does not guarantee that there
are valid messages in the buffer, and this should be checked for before
accessing data in the message.

Fixes: c9aa56edec8e ("net/tap: access primary process queues from secondary")
Cc: rasland@mellanox.com
Cc: stable@dpdk.org
Signed-off-by: Herakliusz Lipiec <herakliusz.lipiec@intel.com>
---
 drivers/net/tap/rte_eth_tap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index e9fda8cf6..a619a8850 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -2101,7 +2101,7 @@ tap_mp_attach_queues(const char *port_name, struct rte_eth_dev *dev)
 	request.len_param = sizeof(*request_param);
 	/* Send request and receive reply */
 	ret = rte_mp_request_sync(&request, &replies, &timeout);
-	if (ret < 0) {
+	if (ret < 0 || replies.n_receieved != 1) {
 		TAP_LOG(ERR, "Failed to request queues from primary: %d",
 			rte_errno);
 		return -1;
-- 
2.17.2