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GUACAMOLE-958: Avoid race/deadlock in guacd_timed_client_free()

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This commit is contained in:
Jonas Zeiger 2020-02-12 15:06:25 +01:00 committed by Jonas Zeiger
parent 5ecad1c3d9
commit 783aa85c1b
1 changed files with 10 additions and 10 deletions
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20
src/guacd/proc.c
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@ -267,24 +267,24 @@ static int guacd_timed_client_free(guac_client* client, int timeout) {
.tv_nsec = current_time.tv_usec * 1000
};
/* Free the client in a separate thread, so we can time the free operation */
if (pthread_create(&client_free_thread, NULL,
guacd_client_free_thread, &free_operation))
return 1;
/* The mutex associated with the pthread conditional and flag MUST be
* acquired before attempting to wait for the condition */
if (pthread_mutex_lock(&free_operation.completed_mutex))
return 1;
/* Wait a finite amount of time for the free operation to finish */
if (pthread_cond_timedwait(&free_operation.completed_cond,
&free_operation.completed_mutex, &deadline))
return 1;
/* Free the client in a separate thread, so we can time the free operation */
if (!pthread_create(&client_free_thread, NULL,
guacd_client_free_thread, &free_operation)) {
/* Wait a finite amount of time for the free operation to finish */
(void) pthread_cond_timedwait(&free_operation.completed_cond,
&free_operation.completed_mutex, &deadline);
}
(void) pthread_mutex_unlock(&free_operation.completed_mutex);
/* Return status of free operation */
return !free_operation.completed;
}
/**