1// RUN: %clangxx_asan -O0 -mllvm -asan-instrument-dynamic-allocas %s -o %t
2// RUN: not %run %t 2>&1 | FileCheck %s
3//
4// REQUIRES: stable-runtime
5
6#include <assert.h>
7#include <stdint.h>
8
9__attribute__((noinline)) void foo(int index, int len) {
10 if (index > len) {
11 char str[len];
12 assert(!(reinterpret_cast<uintptr_t>(str) & 31L));
13 str[index] = '1'; // BOOM
14// CHECK: ERROR: AddressSanitizer: dynamic-stack-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
15// CHECK: WRITE of size 1 at [[ADDR]] thread T0
16 }
17}
18
19int main(int argc, char **argv) {
20 foo(index: 33, len: 10);
21 return 0;
22}
23

source code of compiler-rt/test/asan/TestCases/vla_condition_overflow.cpp