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Ensure that the exit callback is called if CreateProcessA() fails on Windows.

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This patch fixes an issue where the exit handler is not called for the
given process_t in case CreateProcessA() fails. This could, for example,
happen if the user tries to execute a binary that does not exist.

See: https://bugs.torproject.org/31810
This commit is contained in:
Alexander Færøy 2019-10-17 16:47:04 +02:00
parent 85b4a5c276
commit 7a64f6ea04
1 changed files with 18 additions and 0 deletions
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18
src/lib/process/process_win32.c
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@ -234,6 +234,24 @@ process_win32_exec(process_t *process)
CloseHandle(stdin_pipe_read);
CloseHandle(stdin_pipe_write);
/* In the Unix backend, we do not get an error in the Tor process when a
* child process fails to spawn its target executable since we need to
* first do the fork() call in the Tor process and then the child process
* is responsible for doing the call to execve().
*
* This means that the user of the process_exec() API must check for
* whether it returns PROCESS_STATUS_ERROR, which will rarely happen on
* Unix, but will happen for error cases on Windows where it does not
* happen on Unix. For example: when the target executable does not exist
* on the file system.
*
* To have somewhat feature compatibility between the Unix and the Windows
* backend, we here notify the process_t owner that the process have exited
* (even though it never managed to run) to ensure that the exit callback
* is executed.
*/
process_notify_event_exit(process, 0);
return PROCESS_STATUS_ERROR;
}