[Qemu-devel] [PATCH] qapi: fix null pointer dereference on invalid parameter

[Peter Lieven]

qemu segfaults if it receives an invalid parameter via a
qmp command instead of throwing an error.

For example:
{ "execute": "blockdev-add",
    "arguments": { "options" : { "driver": "invalid-driver" } } }

CC: qemu-sta...@nongnu.org
Signed-off-by: Peter Lieven <p...@kamp.de>
---
 qapi/qapi-dealloc-visitor.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/qapi/qapi-dealloc-visitor.c b/qapi/qapi-dealloc-visitor.c
index d0ea118..dc53545 100644
--- a/qapi/qapi-dealloc-visitor.c
+++ b/qapi/qapi-dealloc-visitor.c
@@ -131,7 +131,9 @@ static void qapi_dealloc_end_list(Visitor *v, Error **errp)
 static void qapi_dealloc_type_str(Visitor *v, char **obj, const char *name,
                                   Error **errp)
 {
-    g_free(*obj);
+    if (obj) {
+        g_free(*obj);
+    }
 }
 
 static void qapi_dealloc_type_int(Visitor *v, int64_t *obj, const char *name,
-- 
1.7.9.5