libc: add sanity checks to pthread_mutex_destroy()
Change-Id: Iddb2204fa792fa9aca5f19838926dddbb09b74a2
diff --git a/libc/bionic/pthread.c b/libc/bionic/pthread.c
index 061cce1..e21a1f9 100644
--- a/libc/bionic/pthread.c
+++ b/libc/bionic/pthread.c
@@ -880,8 +880,13 @@
int pthread_mutex_destroy(pthread_mutex_t *mutex)
{
- if (__unlikely(mutex == NULL))
- return EINVAL;
+ int ret;
+
+ /* use trylock to ensure that the mutex value is
+ * valid and is not already locked. */
+ ret = pthread_mutex_trylock(mutex);
+ if (ret != 0)
+ return ret;
mutex->value = 0xdead10cc;
return 0;