1*673dc3d4SNico Weber // RUN: %clang_cl_asan -Od %s -Fe%t 2*673dc3d4SNico Weber // RUN: not %run %t 2>&1 | FileCheck %s 3*673dc3d4SNico Weber 4*673dc3d4SNico Weber class Parent { 5*673dc3d4SNico Weber public: 6*673dc3d4SNico Weber int field; 7*673dc3d4SNico Weber }; 8*673dc3d4SNico Weber 9*673dc3d4SNico Weber class Child : public Parent { 10*673dc3d4SNico Weber public: 11*673dc3d4SNico Weber int extra_field; 12*673dc3d4SNico Weber }; 13*673dc3d4SNico Weber main(void)14*673dc3d4SNico Weberint main(void) { 15*673dc3d4SNico Weber Parent p; 16*673dc3d4SNico Weber Child *c = (Child*)&p; // Intentional error here! 17*673dc3d4SNico Weber c->extra_field = 42; 18*673dc3d4SNico Weber // CHECK: AddressSanitizer: stack-buffer-overflow on address [[ADDR:0x[0-9a-f]+]] 19*673dc3d4SNico Weber // CHECK: WRITE of size 4 at [[ADDR]] thread T0 20*673dc3d4SNico Weber // CHECK-NEXT: {{#0 0x[0-9a-f]* in main .*wrong_downcast_on_stack.cpp}}:[[@LINE-3]] 21*673dc3d4SNico Weber // CHECK: [[ADDR]] is located in stack of thread T0 at offset [[OFFSET:[0-9]+]] in frame 22*673dc3d4SNico Weber // CHECK-NEXT: {{#0 0x[0-9a-f]* in main }} 23*673dc3d4SNico Weber // CHECK: 'p'{{.*}} <== Memory access at offset [[OFFSET]] overflows this variable 24*673dc3d4SNico Weber return 0; 25*673dc3d4SNico Weber } 26*673dc3d4SNico Weber 27