[Qemu-devel] [STABLE][PATCH 01/10] json-parser: Fix segfault on malformed input

[Kevin Wolf]

If the parser fails to parse the key in parse_pair, it will access a NULL
pointer. A simple way to trigger this is sending {foo} via QMP. This patch
turns the segfault into a syntax error reply.

Signed-off-by: Kevin Wolf <address@hidden>
Signed-off-by: Aurelien Jarno <address@hidden>
(cherry picked from commit d758d90fe1f74a46042fca665036a23b4d5fe87d)
---
 json-parser.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/json-parser.c b/json-parser.c
index 2ab6f6c..3497cd3 100644
--- a/json-parser.c
+++ b/json-parser.c
@@ -266,7 +266,7 @@ static int parse_pair(JSONParserContext *ctxt, QDict *dict, 
QList **tokens, va_l
 
     peek = qlist_peek(working);
     key = parse_value(ctxt, &working, ap);
-    if (qobject_type(key) != QTYPE_QSTRING) {
+    if (!key || qobject_type(key) != QTYPE_QSTRING) {
         parse_error(ctxt, peek, "key is not a string in object");
         goto out;
     }
-- 
1.6.6.1