malloc-sizeof.cpp revision 176edba5311f6eff0cad2631449885ddf4fbc9ea 
1// RUN: %clang_cc1 -analyze -analyzer-checker=unix.MallocSizeof -verify %s
2
3#include <stddef.h>
4
5void *malloc(size_t size);
6void *calloc(size_t nmemb, size_t size);
7void *realloc(void *ptr, size_t size);
8void free(void *ptr);
9
10struct A {};
11struct B {};
12
13void foo(unsigned int unsignedInt, unsigned int readSize) {
14  // Sanity check the checker is working as expected.
15  A* a = static_cast<A*>(malloc(sizeof(int))); // expected-warning {{Result of 'malloc' is converted to a pointer of type 'struct A', which is incompatible with sizeof operand type 'int'}}
16  free(a);
17}
18
19void bar() {
20  A *x = static_cast<A*>(calloc(10, sizeof(void*))); // expected-warning {{Result of 'calloc' is converted to a pointer of type 'struct A', which is incompatible with sizeof operand type 'void *'}}
21  // sizeof(void*) is compatible with any pointer.
22  A **y = static_cast<A**>(calloc(10, sizeof(void*))); // no-warning
23  free(x);
24  free(y);
25}
26
27