Fix use-of-uninitialized-value in start_fake_frame #11732
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arnaud-lb
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Jul 22, 2023
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Looks good to me. We may as well initialize it to EG(current_execute_data) (all code paths do it after that).
BTW, was it detected by MSAN? While looking at #9933, I've noticed that since zend_vm_stack_push_call_frame reuses frames, uninitialized VM stack memory may not appear as uninitialized to MSAN. I don't know if we could change that by using __msan_allocated_memory().
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@arnaud-lb Yes, found via MSAN with Clang 16. Allocating call frames with malloc while using MSAN or even ASAN for bounds checking sounds like a good idea! |
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