53 lines
2.7 KiB
C
53 lines
2.7 KiB
C
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// RUN: %clang_analyze_cc1 -analyzer-checker=unix.MallocSizeof -verify %s
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#include <stddef.h>
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void *malloc(size_t size);
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void *calloc(size_t nmemb, size_t size);
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void *realloc(void *ptr, size_t size);
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void free(void *ptr);
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struct A {};
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struct B {};
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void foo(unsigned int unsignedInt, unsigned int readSize) {
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int *ip1 = malloc(sizeof(1));
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int *ip2 = malloc(4 * sizeof(int));
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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'}}
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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'}}
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char *cp3 = malloc(5 * sizeof(char) + 2); // no warning
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unsigned char *buf = malloc(readSize + sizeof(unsignedInt)); // no warning
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struct A *ap1 = calloc(1, sizeof(struct A));
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struct A *ap2 = calloc(2, sizeof(*ap1));
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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 *'}}
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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 *'}}
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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'}}
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struct A *ap6 = realloc(ap5, sizeof(struct A));
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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'}}
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}
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// Don't warn when the types differ only by constness.
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void ignore_const() {
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const char **x = (const char **)malloc(1 * sizeof(char *)); // no-warning
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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 *'}}
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free(x);
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}
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int *mallocArraySize() {
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static const int sTable[10];
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static const int nestedTable[10][2];
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int *table = malloc(sizeof sTable);
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int *table1 = malloc(sizeof nestedTable);
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int (*table2)[2] = malloc(sizeof nestedTable);
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int (*table3)[10][2] = malloc(sizeof nestedTable);
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return table;
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}
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int *mallocWrongArraySize() {
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static const double sTable[10];
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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]'}}
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return table;
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}
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