Bug fix for segfault in stubs library

There was a segfault in the stubs library in posix_memalign because
of a bad parameter. The fix is to send address of the pointer as a
parameter. Also added check of result of posix_memalign.

Patch by Andrey Churbanov.

Differential Revision: http://reviews.llvm.org/D21529

llvm-svn: 273276

1 files changed, 7 insertions, 3 deletions

diff --git a/openmp/runtime/src/kmp_stub.c b/openmp/runtime/src/kmp_stub.c
index 5ca9f97a641..437bf3d538a 100644
--- a/openmp/runtime/src/kmp_stub.c
+++ b/openmp/runtime/src/kmp_stub.c
@@ -111,9 +111,13 @@ void * kmp_aligned_malloc( size_t sz, size_t a ) {
     errno = ENOSYS; // not supported
     return NULL;    // no standard aligned allocator on Windows (pre - C11)
 #else
-    void **res;
-    errno = posix_memalign( res, a, sz );
-    return *res;
+    void *res;
+    int err;
+    if( err = posix_memalign( &res, a, sz ) ) {
+        errno = err; // can be EINVAL or ENOMEM
+        return NULL;
+    }
+    return res;
 #endif
 }
 void * kmp_calloc( size_t nelem, size_t elsize ) { i; return calloc( nelem, elsize ); }