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gh-113343: Fix error check on mmap(2) (#113342)
Fix error check on mmap(2) It should check MAP_FAILED instead of NULL for error. On mmap(2) man page: RETURN VALUE On success, mmap() returns a pointer to the mapped area. On error, the value MAP_FAILED (that is, (void *) -1) is returned, and errno is set to indicate the error.
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@ -247,7 +247,7 @@ new_code_arena(void)
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mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS,
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mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS,
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-1, // fd (not used here)
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-1, // fd (not used here)
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0); // offset (not used here)
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0); // offset (not used here)
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if (!memory) {
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if (memory == MAP_FAILED) {
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PyErr_SetFromErrno(PyExc_OSError);
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PyErr_SetFromErrno(PyExc_OSError);
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PyErr_FormatUnraisable("Failed to create new mmap for perf trampoline");
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PyErr_FormatUnraisable("Failed to create new mmap for perf trampoline");
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perf_status = PERF_STATUS_FAILED;
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perf_status = PERF_STATUS_FAILED;
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