[dpdk-dev] [PATCH] dev: fix devargs memleak on IPC detach request

[Darek Stojaczyk <dariusz.stojaczyk@intel.com>]

Device detach triggered through IPC leaked some memory.
It allocated a devargs objects just to use it for
parsing the devargs string in order to retrieve the
device name. Those devargs weren't passed anywhere
and were never freed.

First of all, let's put those devargs on the stack,
so they doesn't need to be freed. Then free the
additional arguments string as soon as it's allocated,
because we won't need it.

Fixes: ac9e4a17370f ("eal: support attach/detach shared device from secondary")
Cc: qi.z.zhang@intel.com

Signed-off-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
---
 lib/librte_eal/common/hotplug_mp.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/lib/librte_eal/common/hotplug_mp.c b/lib/librte_eal/common/hotplug_mp.c
index 7c9fcc46c..0a822e4c7 100644
--- a/lib/librte_eal/common/hotplug_mp.c
+++ b/lib/librte_eal/common/hotplug_mp.c
@@ -87,7 +87,7 @@ __handle_secondary_request(void *param)
 	const struct eal_dev_mp_req *req =
 		(const struct eal_dev_mp_req *)msg->param;
 	struct eal_dev_mp_req tmp_req;
-	struct rte_devargs *da;
+	struct rte_devargs da;
 	struct rte_device *dev;
 	struct rte_bus *bus;
 	int ret = 0;
@@ -114,15 +114,11 @@ __handle_secondary_request(void *param)
 				goto rollback;
 		}
 	} else if (req->t == EAL_DEV_REQ_TYPE_DETACH) {
-		da = calloc(1, sizeof(*da));
-		if (da == NULL) {
-			ret = -ENOMEM;
-			goto finish;
-		}
-
-		ret = rte_devargs_parse(da, req->devargs);
+		ret = rte_devargs_parse(&da, req->devargs);
 		if (ret != 0)
 			goto finish;
+		free(da.args); /* we don't need those */
+		da.args = NULL;
 
 		ret = eal_dev_hotplug_request_to_secondary(&tmp_req);
 		if (ret != 0) {
@@ -131,16 +127,16 @@ __handle_secondary_request(void *param)
 			goto rollback;
 		}
 
-		bus = rte_bus_find_by_name(da->bus->name);
+		bus = rte_bus_find_by_name(da.bus->name);
 		if (bus == NULL) {
-			RTE_LOG(ERR, EAL, "Cannot find bus (%s)\n", da->bus->name);
+			RTE_LOG(ERR, EAL, "Cannot find bus (%s)\n", da.bus->name);
 			ret = -ENOENT;
 			goto finish;
 		}
 
-		dev = bus->find_device(NULL, cmp_dev_name, da->name);
+		dev = bus->find_device(NULL, cmp_dev_name, da.name);
 		if (dev == NULL) {
-			RTE_LOG(ERR, EAL, "Cannot find plugged device (%s)\n", da->name);
+			RTE_LOG(ERR, EAL, "Cannot find plugged device (%s)\n", da.name);
 			ret = -ENOENT;
 			goto finish;
 		}
-- 
2.17.1