add power-of-two check to posix_memalign, pr
@@ -136,6 +136,7 @@ int posix_memalign(void** p, size_t alignment, size_t size) {
// 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 & (~alignment + 1)) != alignment) return EINVAL; // not a power of 2
void* q = mi_malloc_aligned(size, alignment);
if (q==NULL && size != 0) return ENOMEM;
*p = q;
