[PATCH] throttle-groups: fix memory leak in throttle_group_set_limits

[pannengyuan]

From: PanNengyuan <address@hidden>

This avoid a memory leak when qom-set is called to set throttle_group
limits, here is an easy way to reproduce:

1. run qemu-iotests as follow and check the result with asan:
       ./check -qcow2 184

Following is the asan output backtrack:
Direct leak of 912 byte(s) in 3 object(s) allocated from:
    #0 0xffff8d7ab3c3 in __interceptor_calloc    (/lib64/libasan.so.4+0xd33c3)
    #1 0xffff8d4c31cb in g_malloc0 (/lib64/libglib-2.0.so.0+0x571cb)
    #2 0x190c857 in qobject_input_start_struct  
/mnt/sdc/qemu-master/qemu-4.2.0-rc0/qapi/qobject-input-visitor.c:295
    #3 0x19070df in visit_start_struct 
/mnt/sdc/qemu-master/qemu-4.2.0-rc0/qapi/qapi-visit-core.c:49
    #4 0x1948b87 in visit_type_ThrottleLimits  qapi/qapi-visit-block-core.c:3759
    #5 0x17e4aa3 in throttle_group_set_limits  
/mnt/sdc/qemu-master/qemu-4.2.0-rc0/block/throttle-groups.c:900
    #6 0x1650eff in object_property_set  
/mnt/sdc/qemu-master/qemu-4.2.0-rc0/qom/object.c:1272
    #7 0x1658517 in object_property_set_qobject  
/mnt/sdc/qemu-master/qemu-4.2.0-rc0/qom/qom-qobject.c:26
    #8 0x15880bb in qmp_qom_set 
/mnt/sdc/qemu-master/qemu-4.2.0-rc0/qom/qom-qmp-cmds.c:74
    #9 0x157e3e3 in qmp_marshal_qom_set  qapi/qapi-commands-qom.c:154

Reported-by: Euler Robot <address@hidden>
Signed-off-by: PanNengyuan <address@hidden>
---
 block/throttle-groups.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/throttle-groups.c b/block/throttle-groups.c
index 77014c7..88418e6 100644
--- a/block/throttle-groups.c
+++ b/block/throttle-groups.c
@@ -912,6 +912,7 @@ static void throttle_group_set_limits(Object *obj, Visitor 
*v,
 unlock:
     qemu_mutex_unlock(&tg->lock);
 ret:
+    qapi_free_ThrottleLimits(argp);
     error_propagate(errp, local_err);
     return;
 }
-- 
2.7.2.windows.1