llvm-project/clang/test/Analysis/stackaddrleak.c

// RUN: %clang_cc1 -analyze -analyzer-checker=core -analyzer-store region -verify %s

char const *p;

void f0() {
  char const str[] = "This will change";
  p = str; // expected-warning{{Address of stack memory associated with local variable 'str' is still referred to by the global variable 'p' upon returning to the caller.  This will be a dangling reference}}
}

void f1() {
  char const str[] = "This will change";
  p = str; 
  p = 0; // no-warning
}

void f2() {
  p = (const char *) __builtin_alloca(12);  // expected-warning{{Address of stack memory allocated by call to alloca() on line 17 is still referred to by the global variable 'p' upon returning to the caller.  This will be a dangling reference}}
}

// PR 7383 - previosly the stack address checker would crash on this example
//  because it would attempt to do a direct load from 'pr7383_list'. 
static int pr7383(__const char *__)
{
  return 0;
}
extern __const char *__const pr7383_list[];

// Test that we catch multiple returns via globals when analyzing a function.
void test_multi_return() {
  static int *a, *b;
  int x;
  a = &x;
  b = &x; // expected-warning{{Address of stack memory associated with local variable 'x' is still referred to by the global variable 'a' upon returning}} expected-warning{{Address of stack memory associated with local variable 'x' is still referred to by the global variable 'b' upon returning}}
}