forked from OSchip/llvm-project
[tsan] Fix behavior of realloc(nullptr, 0) on Darwin
On Darwin, there are some apps that rely on realloc(nullptr, 0) returning a valid pointer. TSan currently returns nullptr in this case, let's fix it to avoid breaking binary compatibility. Differential Revision: https://reviews.llvm.org/D22800 llvm-svn: 277458
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@ -195,20 +195,16 @@ void OnUserFree(ThreadState *thr, uptr pc, uptr p, bool write) {
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}
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void *user_realloc(ThreadState *thr, uptr pc, void *p, uptr sz) {
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void *p2 = 0;
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// FIXME: Handle "shrinking" more efficiently,
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// it seems that some software actually does this.
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if (sz) {
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p2 = user_alloc(thr, pc, sz);
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void *p2 = user_alloc(thr, pc, sz);
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if (p2 == 0)
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return 0;
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if (p) {
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uptr oldsz = user_alloc_usable_size(p);
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internal_memcpy(p2, p, min(oldsz, sz));
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}
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}
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if (p)
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user_free(thr, pc, p);
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}
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return p2;
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}
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@ -0,0 +1,20 @@
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// Test that realloc(nullptr, 0) return a non-NULL pointer.
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// RUN: %clang_tsan %s -o %t
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// RUN: %run %t 2>&1 | FileCheck %s
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#include <malloc/malloc.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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int main() {
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void *p = realloc(nullptr, 0);
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if (!p) {
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abort();
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}
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fprintf(stderr, "Okay.\n");
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return 0;
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}
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// CHECK: Okay.
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