evas: check evas class instead of using evas_find

Summary:
A object that is not evas class shouldn't use evas_find. it may occurs segfault.

ref c2e8b492b18bdecc2300ad051ba1406e40ad068f

Test Plan:
Evas *evas = evas_new();
evas_free(evas);
evas_object_line_add(evas);

Check weather there is segfault.

Reviewers: Hermet, raster, zmike

Reviewed By: zmike

Subscribers: cedric, #reviewers, #committers, zmike

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D6816

1 files changed, 3 insertions, 0 deletions

diff --git a/src/lib/emotion/emotion_smart.c b/src/lib/emotion/emotion_smart.c
index d68b84bce4..5f8f46e186 100644
--- a/src/lib/emotion/emotion_smart.c
+++ b/src/lib/emotion/emotion_smart.c
@@ -19,6 +19,8 @@
 #include "Emotion.h"
 #include "emotion_private.h"
 
+#include "canvas/evas_canvas.eo.h"
+
 #ifdef _WIN32
 # define FMT_UCHAR "%c"
 #else
@@ -230,6 +232,7 @@ _clipper_position_size_update(Evas_Object *obj, int x, int y, int w, int h, int
 EAPI Evas_Object *
 emotion_object_add(Evas *evas)
 {
+   EINA_SAFETY_ON_FALSE_RETURN_VAL(efl_isa(evas, EVAS_CANVAS_CLASS), NULL);
    return efl_add(MY_CLASS, evas_find(evas), efl_canvas_object_legacy_ctor(efl_added));
 }