malloc: fix memory element size in case of padding

[ upstream commit 2808a12 ]

This patch fixes wrong inner memory element size when joining two
elements.

Fixes: af75078 ("first public release")

Signed-off-by: Xueming Li <xuemingl@mellanox.com>
Reviewed-by: Anatoly Burakov <anatoly.burakov@intel.com>

lib/librte_eal/common/malloc_elem.c

@@ -468,6 +468,10 @@ join_elem(struct malloc_elem *elem1, struct malloc_elem *elem2)
 	else
 		elem1->heap->last = elem1;
 	elem1->next = next;
+	if (elem1->pad) {
+		struct malloc_elem *inner = RTE_PTR_ADD(elem1, elem1->pad);
+		inner->size = elem1->size - elem1->pad;
+	}
 }
 
 struct malloc_elem *