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124 lines
2.7 KiB
124 lines
2.7 KiB
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include <stdlib.h>
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#include <stdnoreturn.h>
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int* malloc_no_check_bad() {
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int* p = (int*)malloc(sizeof(int));
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*p = 42;
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return p;
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}
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void create_null_path_ok(int* p) {
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if (p) {
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*p = 32;
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}
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}
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void call_create_null_path_then_deref_unconditionally_ok(int* p) {
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create_null_path_ok(p);
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*p = 52;
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}
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void create_null_path2_latent(int* p) {
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int* q = NULL;
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if (p) {
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*p = 32;
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}
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// arguably bogus to check p above but not here, but the above could
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// also be macro-generated code so both reporting and not reporting
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// are sort of justifiable
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*p = 52;
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}
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// combine several of the difficulties above
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void malloc_then_call_create_null_path_then_deref_unconditionally_latent(
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int* p) {
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int* x = (int*)malloc(sizeof(int));
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if (p) {
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*p = 32;
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}
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create_null_path_ok(p);
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*p = 52;
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free(x);
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}
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// pulse should remember the value of vec[64] because it was just written to
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void nullptr_deref_young_bad(int* x) {
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int* vec[65] = {x, x, x, x, x, x, x, x, x, x, x, x, x, x, x, x, x,
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x, x, x, x, x, x, x, x, x, x, x, x, x, x, x, x, x,
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x, x, x, x, x, x, x, x, x, x, x, x, x, x, x, x, x,
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x, x, x, x, x, x, x, x, x, x, x, x, x, NULL};
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int p = *vec[64];
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}
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// due to the recency model of memory accesses, vec[0] can get forgotten
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// by the time we have processed the last element of the
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// initialization so we don't report here
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void FN_nullptr_deref_old_bad(int* x) {
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int* vec[65] = {NULL, x, x, x, x, x, x, x, x, x, x, x, x, x, x, x, x,
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x, x, x, x, x, x, x, x, x, x, x, x, x, x, x, x, x,
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x, x, x, x, x, x, x, x, x, x, x, x, x, x, x, x, x,
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x, x, x, x, x, x, x, x, x, x, x, x, x, x};
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int p = *vec[0];
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}
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void malloc_free_ok() {
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int* p = (int*)malloc(sizeof(int));
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free(p);
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}
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void wrap_free(void* p) { free(p); }
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void interproc_free_ok() {
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int* p = (int*)malloc(sizeof(int));
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wrap_free(p);
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}
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noreturn void no_return();
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void wrap_malloc(int** x) {
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*x = (int*)malloc(sizeof(int));
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if (!*x) {
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no_return();
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}
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}
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void call_no_return_good() {
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int* x = NULL;
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wrap_malloc(&x);
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*x = 5;
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free(x);
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}
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void bug_after_malloc_result_test_bad(int* x) {
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x = (int*)malloc(sizeof(int));
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if (x) {
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int* y = NULL;
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*y = 42;
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}
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}
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void bug_after_abduction_bad(int* x) {
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*x = 42;
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int* y = NULL;
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*y = 42;
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}
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void bug_with_allocation_bad(int* x) {
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x = (int*)malloc(sizeof(int*));
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int* y = NULL;
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*y = 42;
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}
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void null_alias_bad(int* x) {
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int* y = NULL;
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x = (int*)malloc(sizeof(int*));
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*x = 42;
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}
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