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      1 // RUN: %clang_cc1 -analyze -analyzer-checker=unix.MallocSizeof -verify %s
      2 
      3 #include <stddef.h>
      4 
      5 void *malloc(size_t size);
      6 void *calloc(size_t nmemb, size_t size);
      7 void *realloc(void *ptr, size_t size);
      8 void free(void *ptr);
      9 
     10 struct A {};
     11 struct B {};
     12 
     13 void foo(unsigned int unsignedInt, unsigned int readSize) {
     14   int *ip1 = malloc(sizeof(1));
     15   int *ip2 = malloc(4 * sizeof(int));
     16 
     17   long *lp1 = malloc(sizeof(short)); // expected-warning {{Result of 'malloc' is converted to a pointer of type 'long', which is incompatible with sizeof operand type 'short'}}
     18   long *lp2 = malloc(5 * sizeof(double)); // expected-warning {{Result of 'malloc' is converted to a pointer of type 'long', which is incompatible with sizeof operand type 'double'}}
     19   char *cp3 = malloc(5 * sizeof(char) + 2); // no warning
     20   unsigned char *buf = malloc(readSize + sizeof(unsignedInt)); // no warning
     21 
     22   struct A *ap1 = calloc(1, sizeof(struct A));
     23   struct A *ap2 = calloc(2, sizeof(*ap1));
     24   struct A *ap3 = calloc(2, sizeof(ap1)); // expected-warning {{Result of 'calloc' is converted to a pointer of type 'struct A', which is incompatible with sizeof operand type 'struct A *'}}
     25   struct A *ap4 = calloc(3, sizeof(struct A*)); // expected-warning {{Result of 'calloc' is converted to a pointer of type 'struct A', which is incompatible with sizeof operand type 'struct A *'}}
     26   struct A *ap5 = calloc(4, sizeof(struct B)); // expected-warning {{Result of 'calloc' is converted to a pointer of type 'struct A', which is incompatible with sizeof operand type 'struct B'}}
     27   struct A *ap6 = realloc(ap5, sizeof(struct A));
     28   struct A *ap7 = realloc(ap5, sizeof(struct B)); // expected-warning {{Result of 'realloc' is converted to a pointer of type 'struct A', which is incompatible with sizeof operand type 'struct B'}}
     29 }
     30 
     31 // Don't warn when the types differ only by constness.
     32 void ignore_const() {
     33   const char **x = (const char **)malloc(1 * sizeof(char *)); // no-warning
     34   const char ***y = (const char ***)malloc(1 * sizeof(char *)); // expected-warning {{Result of 'malloc' is converted to a pointer of type 'const char **', which is incompatible with sizeof operand type 'char *'}}
     35   free(x);
     36 }
     37 
     38 int *mallocArraySize() {
     39   static const int sTable[10];
     40   static const int nestedTable[10][2];
     41   int *table = malloc(sizeof sTable);
     42   int *table1 = malloc(sizeof nestedTable);
     43   int (*table2)[2] = malloc(sizeof nestedTable);
     44   int (*table3)[10][2] = malloc(sizeof nestedTable);
     45   return table;
     46 }
     47 
     48 int *mallocWrongArraySize() {
     49   static const double sTable[10];
     50   int *table = malloc(sizeof sTable); // expected-warning {{Result of 'malloc' is converted to a pointer of type 'int', which is incompatible with sizeof operand type 'const double [10]'}}
     51   return table;
     52 }
     53