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init_process_info() memset the pointer parameter instead of the PROCESS_INFORMATION structure it points at, leaving the struct uninitialized before CreateProcessW(). Zero it through the pointer. find_comspec_nt() dereferences *comspec in its cleanup while the caller only assigns it on success, so a failed SearchPathW() read an indeterminate value. Initialize the caller's variable to NULL. set_proc_descriptor_to_blackhole() tested CreateFileA() against NULL, but CreateFileA() signals failure with INVALID_HANDLE_VALUE, so a failed open went undetected and an invalid handle was inherited by the child. Test against INVALID_HANDLE_VALUE.
ndossche
approved these changes
Sep 18, 2026
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| static void init_process_info(PROCESS_INFORMATION *pi) | ||
| { | ||
| memset(&pi, 0, sizeof(pi)); |
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Fix three Win32-only defects in proc_open: init_process_info() memset the pointer parameter instead of the PROCESS_INFORMATION structure it points at; find_comspec_nt()'s cleanup dereferenced *comspec before the caller assigned it on the SearchPathW() failure path; and set_proc_descriptor_to_blackhole() tested CreateFileA() against NULL instead of INVALID_HANDLE_VALUE.