| 1 | // RUN: %clangxx_asan -O0 %s -o %t |
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| 2 | // Default is true (free on realloc to 0 size) |
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| 3 | // RUN: %run %t 2>&1 | FileCheck %s |
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| 4 | // RUN: %env_asan_opts=allocator_frees_and_returns_null_on_realloc_zero=true %run %t 2>&1 | FileCheck %s |
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| 5 | // RUN: %env_asan_opts=allocator_frees_and_returns_null_on_realloc_zero=false %run %t 2>&1 | FileCheck %s --check-prefix=NO-FREE |
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| 6 | |
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| 7 | #include <stdio.h> |
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| 8 | #include <stdlib.h> |
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| 9 | |
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| 10 | int main() { |
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| 11 | void *p = malloc(size: 42); |
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| 12 | p = realloc(ptr: p, size: 0); |
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| 13 | if (p) { |
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| 14 | // NO-FREE: Allocated something on realloc(p, 0) |
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| 15 | fprintf(stderr, format: "Allocated something on realloc(p, 0)\n" ); |
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| 16 | } else { |
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| 17 | // CHECK: realloc(p, 0) returned nullptr |
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| 18 | fprintf(stderr, format: "realloc(p, 0) returned nullptr\n" ); |
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| 19 | } |
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| 20 | free(ptr: p); |
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| 21 | } |
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| 22 | |
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