commit 338137221c8bd89f6d611c0cd3bf7b8a85d02517 Author: Alexander Færøy ahf@torproject.org Date: Thu Nov 22 18:14:03 2018 +0100

Make sure we call process_notify_event_exit() as the last thing in different callbacks.

This patch makes sure that we call process_notify_event_exit() after we have done any modifications we need to do to the state of a process_t. This allows application developers to call process_free() in the exit_callback of the process.

See: https://bugs.torproject.org/28179 --- src/lib/process/process_unix.c | 10 +++++++--- src/lib/process/process_win32.c | 7 +++++-- 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/src/lib/process/process_unix.c b/src/lib/process/process_unix.c index fa03fdbbe..4f46bbd88 100644 --- a/src/lib/process/process_unix.c +++ b/src/lib/process/process_unix.c @@ -549,12 +549,16 @@ process_unix_waitpid_callback(int status, void *data) process_t *process = data; process_unix_t *unix_process = process_get_unix_process(process);

- /* Notify our process. */ - process_notify_event_exit(process, status); - /* Remove our waitpid callback. */ clear_waitpid_callback(unix_process->waitpid); unix_process->waitpid = NULL; + + /* Notify our process. */ + process_notify_event_exit(process, status); + + /* Make sure you don't modify the process after we have called + * process_notify_event_exit() on it, to allow users to process_free() it in + * the exit callback. */ }

/** This function sets the file descriptor in the <b>handle</b> as non-blocking diff --git a/src/lib/process/process_win32.c b/src/lib/process/process_win32.c index 3e97f3780..7422493de 100644 --- a/src/lib/process/process_win32.c +++ b/src/lib/process/process_win32.c @@ -445,12 +445,15 @@ process_win32_timer_callback(periodic_timer_t *timer, void *data) tor_assert(data == NULL);

log_debug(LD_PROCESS, "Windows Process I/O timer ticked"); + + /* Move the process into an alertable state. */ + process_win32_trigger_completion_callbacks(); + + /* Check if our processes are still alive. */ const smartlist_t *processes = process_get_all_processes();

SMARTLIST_FOREACH(processes, process_t *, p, process_win32_timer_test_process(p)); - - process_win32_trigger_completion_callbacks(); }

/** Test whether a given process is still alive. Notify the Process subsystem