[PATCH] bugfix: hostmem: Free host_nodes list right after visited

[Keqian Zhu]

In host_memory_backend_get_host_nodes, we build host_nodes
list and output it to v (a StringOutputVisitor) but forget
to free the list. This fixes the memory leak.

The memory leak stack:

==qemu-kvm==209357==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 32 byte(s) in 2 object(s) allocated from:
  #0 0xfffe430e3393 in __interceptor_calloc (/lib64/libasan.so.4+0xd3393)  ??:?
  #1 0xfffe41d58b9b in g_malloc0 (/lib64/libglib-2.0.so.0+0x58b9b)  ??:?
  #2 0xaaac0cdb6e43 (/usr/libexec/qemu-kvm+0xe16e43)  backends/hostmem.c:94
  #3 0xaaac0d2edf83 (/usr/libexec/qemu-kvm+0x134df83) qom/object.c:1478
  #4 0xaaac0c976513 (/usr/libexec/qemu-kvm+0x9d6513)  
hw/core/machine-qmp-cmds.c:312
  #5 0xaaac0d2e980b (/usr/libexec/qemu-kvm+0x134980b) qom/object.c:1001
  #6 0xaaac0c97779b (/usr/libexec/qemu-kvm+0x9d779b)  
hw/core/machine-qmp-cmds.c:328 (discriminator 1)
  #7 0xaaac0d26ed3f (/usr/libexec/qemu-kvm+0x12ced3f) 
qapi/qapi-commands-machine.c:327
  #8 0xaaac0d43d647 (/usr/libexec/qemu-kvm+0x149d647) qapi/qmp-dispatch.c:147
  #9 0xaaac0d21f74b (/usr/libexec/qemu-kvm+0x127f74b) monitor/qmp.c:120
  #10 0xaaac0d22074b (/usr/libexec/qemu-kvm+0x128074b) monitor/qmp.c:209 
(discriminator 4)
  #11 0xaaac0d4daefb (/usr/libexec/qemu-kvm+0x153aefb) util/async.c:117
  #12 0xaaac0d4e30fb (/usr/libexec/qemu-kvm+0x15430fb) util/aio-posix.c:459
  #13 0xaaac0d4dac8f (/usr/libexec/qemu-kvm+0x153ac8f) util/async.c:268
  #14 0xfffe41d52a6b in g_main_context_dispatch 
(/lib64/libglib-2.0.so.0+0x52a6b)  ??:?
  #15 0xaaac0d4e0e97 (/usr/libexec/qemu-kvm+0x1540e97)  util/main-loop.c:218
  #16 0xaaac0cd9bfa7 (/usr/libexec/qemu-kvm+0xdfbfa7)  vl.c:1791
  #17 0xaaac0c823bc3 (/usr/libexec/qemu-kvm+0x883bc3)  vl.c:4473
  #18 0xfffe40ab3ebf in __libc_start_main (/lib64/libc.so.6+0x23ebf)  ??:?
  #19 0xaaac0c82ed5f (/usr/libexec/qemu-kvm+0x88ed5f)  ??:?
SUMMARY: AddressSanitizer: 32 byte(s) leaked in 2 allocation(s).

Fixes: 4cf1b76bf1e2 (hostmem: add properties for NUMA memory policy)
Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
---
 backends/hostmem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/backends/hostmem.c b/backends/hostmem.c
index 4bde00e8e7..9f9ac95edd 100644
--- a/backends/hostmem.c
+++ b/backends/hostmem.c
@@ -105,6 +105,7 @@ host_memory_backend_get_host_nodes(Object *obj, Visitor *v, 
const char *name,
 
 ret:
     visit_type_uint16List(v, name, &host_nodes, errp);
+    qapi_free_uint16List(host_nodes);
 }
 
 static void
-- 
2.23.0