commit b2219ae216a141acdf0e2a3f67d2c85aee2a2bc2
Author: Dragan Dosen <ddosen@haproxy.com>
Date:   Fri May 4 16:27:15 2018 +0200

    BUG/MINOR: map: correctly track reference to the last ref_elt being dumped
    
    The bug was introduced in the commit 8d85aa4 ("BUG/MAJOR: map: fix
    segfault during 'show map/acl' on cli").
    
    This patch should be backported to 1.8, 1.7 and 1.6.
    
    (cherry picked from commit 336a11f75571ad46f74a7c6247c13ed44f95da93)
    Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/src/map.c b/src/map.c
index f40e4394..a9a1e53c 100644
--- a/src/map.c
+++ b/src/map.c
@@ -307,9 +307,9 @@ static int cli_io_handler_pat_list(struct appctx *appctx)
 		 * reference to the last ref_elt being dumped.
 		 */
 		if (appctx->st2 == STAT_ST_LIST) {
-			if (!LIST_ISEMPTY(&appctx->ctx.sess.bref.users)) {
-				LIST_DEL(&appctx->ctx.sess.bref.users);
-				LIST_INIT(&appctx->ctx.sess.bref.users);
+			if (!LIST_ISEMPTY(&appctx->ctx.map.bref.users)) {
+				LIST_DEL(&appctx->ctx.map.bref.users);
+				LIST_INIT(&appctx->ctx.map.bref.users);
 			}
 		}
 		return 1;