fix double free of lock in pthread_mutex_destroy

1 files changed, 5 insertions, 2 deletions

diff --git a/include/compat/pthread.h b/include/compat/pthread.h
index 8211dda..7702dcd 100644
--- a/include/compat/pthread.h
+++ b/include/compat/pthread.h
@@ -110,8 +110,11 @@ pthread_mutex_unlock(pthread_mutex_t *mutex)
 static inline int
 pthread_mutex_destroy(pthread_mutex_t *mutex)
 {
-        DeleteCriticalSection(mutex->lock);
-        free(mutex->lock);
+        if (mutex->lock != NULL) {
+                DeleteCriticalSection(mutex->lock);
+                free(mutex->lock);
+                mutex->lock = NULL;
+        }
         return 0;
 }