1 files changed, 18 insertions, 0 deletions
diff --git a/test/asan/TestCases/alloca_overflow_partial.cc b/test/asan/TestCases/alloca_overflow_partial.cc
new file mode 100644
index 0000000000000..590f35465dadb
--- /dev/null
+++ b/test/asan/TestCases/alloca_overflow_partial.cc
@@ -0,0 +1,18 @@
+// RUN: %clangxx_asan -O0 -mllvm -asan-instrument-allocas %s -o %t
+// RUN: not %run %t 2>&1 | FileCheck %s
+//
+
+#include <assert.h>
+
+__attribute__((noinline)) void foo(int index, int len) {
+  volatile char str[len] __attribute__((aligned(32)));
+  assert(!(reinterpret_cast<long>(str) & 31L));
+  str[index] = '1'; // BOOM
+// CHECK: ERROR: AddressSanitizer: dynamic-stack-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
+// CHECK: WRITE of size 1 at [[ADDR]] thread T0
+}
+
+int main(int argc, char **argv) {
+  foo(10, 10);
+  return 0;
+}