Silence "Use of memory after it is freed" by asserting the head and tail of list...

diff --git a/lib/isc/include/isc/list.h b/lib/isc/include/isc/list.h
index c9bdfc7ad6bc854c6be4d059b600a6082aa8c562..508f9fe6a0c6a1b7e1466cf4405b663c60cd0257 100644 (file)
--- a/lib/isc/include/isc/list.h
+++ b/lib/isc/include/isc/list.h
@@ -102,6 +102,8 @@
                } \
                (elt)->link.prev = (type *)(-1); \
                (elt)->link.next = (type *)(-1); \
+               ISC_INSIST((list).head != (elt)); \
+               ISC_INSIST((list).head != (elt)); \
        } while (0)
 
 #define __ISC_LIST_UNLINKUNSAFE(list, elt, link) \