font: check FT_Get_Postscript_Name return value for NULL

diff --git a/libass/ass_font.c b/libass/ass_font.c
index 0b924b5b4f1e839b1b3bf1726f2142950a34a726..abc661ea8b53c8eccd9ce0f1224381f36aaa9fa3 100644 (file)
--- a/libass/ass_font.c
+++ b/libass/ass_font.c
@@ -201,7 +201,9 @@ static int add_face(ASS_FontSelector *fontsel, ASS_Font *font, uint32_t ch)
                     return -1;
                 }
 
-                if (strcmp(FT_Get_Postscript_Name(face), postscript_name) == 0)
+                const char *face_psname = FT_Get_Postscript_Name(face);
+                if (face_psname != NULL &&
+                    strcmp(face_psname, postscript_name) == 0)
                     break;
             }
         }