kasan: Potential recursive registration shadow area error

When initializing a memory block, the shadow area record of the first
memory block is used first.When uninitializing, unpoison is required, otherwise the memory will be marked incorrectly.
The following case will cause problems:
    void *mem = malloc(1024);
    struct mm_heap_s *a = mm_initialize("hello", mem, 1024);
    int *b = mm_malloc(a, sizeof(int *));
    *b = 100;
    printf("Hello, World!! %d\n", *b);
    mm_free(a, b);
    mm_uninitialize(a);
    free(mem);

Signed-off-by: wangmingrong1 <wangmingrong1@xiaomi.com>

mm/kasan/generic.c

@@ -268,10 +268,13 @@ void kasan_unregister(FAR void *addr)
     {
       if (g_region[i]->begin == (uintptr_t)addr)
         {
+          size_t size = g_region[i]->end - g_region[i]->begin;
           g_region_count--;
           memmove(&g_region[i], &g_region[i + 1],
                   (g_region_count - i) * sizeof(g_region[0]));
-          break;
+          spin_unlock_irqrestore(&g_lock, flags);
+          kasan_unpoison(addr, size);
+          return;
         }
     }
 

mm/kasan/sw_tags.c

@@ -217,10 +217,13 @@ void kasan_unregister(FAR void *addr)
     {
       if (g_region[i]->begin == (uintptr_t)addr)
         {
+          size_t size = g_region[i]->end - g_region[i]->begin;
           g_region_count--;
           memmove(&g_region[i], &g_region[i + 1],
                   (g_region_count - i) * sizeof(g_region[0]));
-          break;
+          spin_unlock_irqrestore(&g_lock, flags);
+          kasan_unpoison(addr, size);
+          return;
         }
     }