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[PATCH v8 02/21] module: check module wasn't already initialized

From: Bulekov, Alexander
Subject: [PATCH v8 02/21] module: check module wasn't already initialized
Date: Wed, 29 Jan 2020 05:34:12 +0000

The virtual-device fuzzer must initialize QOM, prior to running
vl:qemu_init, so that it can use the qos_graph to identify the arguments
required to initialize a guest for libqos-assisted fuzzing. This change
prevents errors when vl:qemu_init tries to (re)initialize the previously
initialized QOM module.

Signed-off-by: Alexander Bulekov <address@hidden>
Reviewed-by: Stefan Hajnoczi <address@hidden>
Reviewed-by: Darren Kenny <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
 util/module.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/util/module.c b/util/module.c
index 8c5315a7a3..236a7bb52a 100644
--- a/util/module.c
+++ b/util/module.c
@@ -30,6 +30,7 @@ typedef struct ModuleEntry
 typedef QTAILQ_HEAD(, ModuleEntry) ModuleTypeList;
 static ModuleTypeList init_type_list[MODULE_INIT_MAX];
+static bool modules_init_done[MODULE_INIT_MAX];
 static ModuleTypeList dso_init_list;
@@ -91,11 +92,17 @@ void module_call_init(module_init_type type)
     ModuleTypeList *l;
     ModuleEntry *e;
+    if (modules_init_done[type]) {
+        return;
+    }
     l = find_type(type);
     QTAILQ_FOREACH(e, l, node) {
+    modules_init_done[type] = true;

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