From d146984a910d71eebc2610ae9be0f4774f75357b Mon Sep 17 00:00:00 2001
From: Julian Fang <julianisabear@gmail.com>
Date: Thu, 27 Jun 2019 16:18:50 +0800
Subject: [PATCH] Return EINVAL when alignment is not a power of 2 to match
 posix standard

---
 src/alloc-override.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/alloc-override.c b/src/alloc-override.c
index e06a3e6e..6735fbe0 100644
--- a/src/alloc-override.c
+++ b/src/alloc-override.c
@@ -135,7 +135,7 @@ int posix_memalign(void** p, size_t alignment, size_t size) {
   // TODO: the spec says we should return EINVAL also if alignment is not a power of 2.
   // The spec also dictates we should not modify `*p` on an error. (issue#27)
   // <http://man7.org/linux/man-pages/man3/posix_memalign.3.html>
-  if (alignment % sizeof(void*) != 0) return EINVAL;  // no `p==NULL` check as it is declared as non-null
+  if ((alignment % sizeof(void*))||(alignment % 2)  != 0) return EINVAL;  // no `p==NULL` check as it is declared as non-null
   void* q = mi_malloc_aligned(size, alignment);
   if (q==NULL && size != 0) return ENOMEM;
   *p = q;