Merge pull request gnuradio#523 from AlexandreRouma/main

Fix allocated size not a multiple of alignment

lib/volk_malloc.c

@@ -50,6 +50,17 @@
 
 void* volk_malloc(size_t size, size_t alignment)
 {
+    if ((size == 0) || (alignment == 0)) {
+        fprintf(stderr, "VOLK: Error allocating memory: either size or alignment is 0");
+        return NULL;
+    }
+    // Tweak size to satisfy ASAN (the GCC address sanitizer).
+    // Calling 'volk_malloc' might therefor result in the allocation of more memory than
+    // requested for correct alignment. Any allocation size change here will in general not
+    // impact the end result since initial size alignment is required either way.
+    if (size % alignment) {
+        size += alignment - (size % alignment);
+    }
 #if HAVE_POSIX_MEMALIGN
     // quoting posix_memalign() man page:
     // "alignment must be a power of two and a multiple of sizeof(void *)"