commit edb4427ab7c070a16cb9a23460f68b3fc3c041bb
Author: Willy Tarreau <w@1wt.eu>
Date:   Sun May 6 14:50:09 2018 +0200

    BUG/MINOR: lua: ensure large proxy IDs can be represented
    
    In function hlua_fcn_new_proxy() too small a buffer was passed to
    snprintf(), resulting in large proxy or listener IDs to make
    snprintf() fail. It is unlikely to meet this case but let's fix it
    anyway.
    
    This fix must be backported to all stable branches where it applies.
    
    (cherry picked from commit 29d698040d6bb56b29c036aeba05f0d52d8ce94b)
    Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/src/hlua_fcn.c b/src/hlua_fcn.c
index a8d53d45..1df08f85 100644
--- a/src/hlua_fcn.c
+++ b/src/hlua_fcn.c
@@ -796,7 +796,7 @@ int hlua_fcn_new_proxy(lua_State *L, struct proxy *px)
 	struct server *srv;
 	struct listener *lst;
 	int lid;
-	char buffer[10];
+	char buffer[17];
 
 	lua_newtable(L);
 
@@ -836,7 +836,7 @@ int hlua_fcn_new_proxy(lua_State *L, struct proxy *px)
 		if (lst->name)
 			lua_pushstring(L, lst->name);
 		else {
-			snprintf(buffer, 10, "sock-%d", lid);
+			snprintf(buffer, sizeof(buffer), "sock-%d", lid);
 			lid++;
 			lua_pushstring(L, buffer);
 		}