[dpdk-dev] [PATCH] net/bonding: fix double fetch for active_slave_count

[Haifeng Lin]

1. when memcpy slaves the internals->active_slave_count 1
2. return internals->active_slave_count is 2
3. the slaves[1] would be a random invalid value
---
 drivers/net/bonding/rte_eth_bond_api.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/bonding/rte_eth_bond_api.c b/drivers/net/bonding/rte_eth_bond_api.c
index 21bcd50..ed7b02e 100644
--- a/drivers/net/bonding/rte_eth_bond_api.c
+++ b/drivers/net/bonding/rte_eth_bond_api.c
@@ -815,6 +815,7 @@
 		uint16_t len)
 {
 	struct bond_dev_private *internals;
+	uint16_t active_slave_count;
 
 	if (valid_bonded_port_id(bonded_port_id) != 0)
 		return -1;
@@ -824,13 +825,14 @@
 
 	internals = rte_eth_devices[bonded_port_id].data->dev_private;
 
-	if (internals->active_slave_count > len)
+	active_slave_count = internals->active_slave_count;
+	if (active_slave_count > len)
 		return -1;
 
 	memcpy(slaves, internals->active_slaves,
-	internals->active_slave_count * sizeof(internals->active_slaves[0]));
+			active_slave_count * sizeof(internals->active_slaves[0]));
 
-	return internals->active_slave_count;
+	return active_slave_count;
 }
 
 int
-- 
1.8.5.2.msysgit.0