--- libmalloc/libmalloc-409.81.2/src/magazine_tiny.c
+++ libmalloc/libmalloc-646.0.13/src/magazine_tiny.c
@@ -37,25 +37,6 @@
 // Decrements the size part of mag_last_free by a given msize value. Must not
 // reduce the msize part below zero (not checked).
 #define TINY_MAG_LAST_FREE_PTR_DEC_MSIZE(x, msize_delta) (x) = ((void *)(x) - (msize_delta))
-
-static MALLOC_INLINE MALLOC_ALWAYS_INLINE
-mag_index_t
-tiny_mag_get_thread_index(void)
-{
-#if CONFIG_TINY_USES_HYPER_SHIFT
-	if (os_likely(_os_cpu_number_override == -1)) {
-		return _malloc_cpu_number() >> hyper_shift;
-	} else {
-		return _os_cpu_number_override >> hyper_shift;
-	}
-#else // CONFIG_SMALL_USES_HYPER_SHIFT
-	if (os_likely(_os_cpu_number_override == -1)) {
-		return _malloc_cpu_number();
-	} else {
-		return _os_cpu_number_override;
-	}
-#endif // CONFIG_SMALL_USES_HYPER_SHIFT
-}
 
 static inline grain_t
 tiny_slot_from_msize(msize_t msize)
@@ -296,7 +277,7 @@
 		if (!clear) {
 			break;
 		}
-		// fall through
+		MALLOC_FALLTHROUGH;
 	case MALLOC_ZERO_ON_ALLOC:
 		memset(ptr, '\0', TINY_BYTES_FOR_MSIZE(msize));
 		break;
@@ -2269,6 +2250,12 @@
 				BITMAPV_CLR(tiny_mag_ptr->mag_bitmap, slot);
 			}
 			this_msize = get_tiny_free_size(ptr);
+			if (os_unlikely(this_msize < msize)) {
+				malloc_zone_error(MALLOC_ABORT_ON_CORRUPTION, true,
+						"Corruption of tiny freelist %p: size too small (%u/%u)\n",
+						ptr, this_msize, msize);
+
+			}
 			tiny_update_region_free_list_for_remove(slot, ptr, next);
 			tiny_check_and_zero_inline_meta_from_freelist(rack, ptr, this_msize);
 			goto add_leftover_and_proceed;
@@ -2285,6 +2272,11 @@
 	ptr = limit->p;
 	if (ptr) {
 		this_msize = get_tiny_free_size(ptr);
+        if (os_unlikely(this_msize < msize)) {
+            malloc_zone_error(MALLOC_ABORT_ON_CORRUPTION, true,
+                    "Corruption of tiny freelist %p: size too small (%u/%u)\n",
+                    ptr, this_msize, msize);
+        }
 		next = free_list_unchecksum_ptr(rack, &ptr->next);
 		if (this_msize - msize > NUM_TINY_SLOTS) {
 			// the leftover will go back to the free list, so we optimize by
@@ -2415,7 +2407,7 @@
 tiny_malloc_should_clear(rack_t *rack, msize_t msize, boolean_t cleared_requested)
 {
 	void *ptr;
-	mag_index_t mag_index = tiny_mag_get_thread_index() % rack->num_magazines;
+	mag_index_t mag_index = rack_get_thread_index(rack) % rack->num_magazines;
 	magazine_t *tiny_mag_ptr = &(rack->magazines[mag_index]);
 
 	MALLOC_TRACE(TRACE_tiny_malloc, (uintptr_t)rack, TINY_BYTES_FOR_MSIZE(msize), (uintptr_t)tiny_mag_ptr, cleared_requested);
@@ -2677,7 +2669,8 @@
 {
 	msize_t msize = TINY_MSIZE_FOR_BYTES(size + TINY_QUANTUM - 1);
 	unsigned found = 0;
-	mag_index_t mag_index = tiny_mag_get_thread_index() % szone->tiny_rack.num_magazines;
+
+	mag_index_t mag_index = rack_get_thread_index(&szone->tiny_rack) % szone->tiny_rack.num_magazines;
 	magazine_t *tiny_mag_ptr = &(szone->tiny_rack.magazines[mag_index]);
 
 	// make sure to return objects at least one quantum in size