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
