Re: [uclibc-ng-devel] [PATCH] linuxthreads.old: Fix segfault when pthread_mutex_unlock() called against unlocked NORMAL mutex.

Althought, it is undefined behavior, there is no reason for segfault. Signed-off-by: Leonid Lisovskiy <lly.dev(a)gmail.com> --- libpthread/linuxthreads/mutex.c | 3 ++- test/pthread/ex8-mtx-odd.c | 56 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+), 1 deletion(-) create mode 100644 test/pthread/ex8-mtx-odd.c diff --git a/libpthread/linuxthreads/mutex.c b/libpthread/linuxthreads/mutex.c index 8908414..8cb779b 100644 --- a/libpthread/linuxthreads/mutex.c +++ b/libpthread/linuxthreads/mutex.c @@ -171,7 +171,8 @@ int attribute_hidden __pthread_mutex_unlock(pthread_mutex_t * mutex) { switch (mutex->__m_kind) { case PTHREAD_MUTEX_ADAPTIVE_NP: - __pthread_unlock(&mutex->__m_lock); + if (mutex->__m_lock.__status != 0) + __pthread_unlock(&mutex->__m_lock); return 0; case PTHREAD_MUTEX_RECURSIVE_NP: if (mutex->__m_owner != thread_self())