[PULL 5/6] tests/plugins: fix use-after-free bug

Paolo Bonzini posted 6 patches 1 year, 10 months ago
Maintainers: "Alex Bennée" <alex.bennee@linaro.org>, Alexandre Iooss <erdnaxe@crans.org>, Mahmoud Mandour <ma.mandourr@gmail.com>, Pierrick Bouvier <pierrick.bouvier@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>, Thomas Huth <thuth@redhat.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>
[PULL 5/6] tests/plugins: fix use-after-free bug
Posted by Paolo Bonzini 1 year, 10 months ago
rec->count.score is inside rec, which is freed before rec->count.score is.
Reorder the instructions

Reported by Coverity as CID 1539967.

Cc: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 contrib/plugins/howvec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/contrib/plugins/howvec.c b/contrib/plugins/howvec.c
index 2d10c87e0fb..94bbc53820a 100644
--- a/contrib/plugins/howvec.c
+++ b/contrib/plugins/howvec.c
@@ -167,9 +167,9 @@ static gint cmp_exec_count(gconstpointer a, gconstpointer b)
 static void free_record(gpointer data)
 {
     InsnExecCount *rec = (InsnExecCount *) data;
+    qemu_plugin_scoreboard_free(rec->count.score);
     g_free(rec->insn);
     g_free(rec);
-    qemu_plugin_scoreboard_free(rec->count.score);
 }
 
 static void plugin_exit(qemu_plugin_id_t id, void *p)
-- 
2.44.0