[njs] Fixed heap-use-after-free in await frame.

[Alexander Borisov]

details:   https://hg.nginx.org/njs/rev/360384498060
branches:  
changeset: 1732:360384498060
user:      Alexander Borisov <alexander.borisov at nginx.com>
date:      Mon Nov 01 18:32:48 2021 +0300
description:
Fixed heap-use-after-free in await frame.

The bug was introduced in 92d10cd761e2 (0.7.0).

diffstat:

 src/njs_async.c |  2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diffs (12 lines):

diff -r d2e23f936214 -r 360384498060 src/njs_async.c
--- a/src/njs_async.c	Fri Oct 29 13:57:26 2021 +0000
+++ b/src/njs_async.c	Mon Nov 01 18:32:48 2021 +0300
@@ -72,6 +72,8 @@ njs_await_fulfilled(njs_vm_t *vm, njs_va
     }
 
     async = ctx->await;
+    async->previous = vm->top_frame;
+
     function = async->function;
 
     cur_local = vm->levels[NJS_LEVEL_LOCAL];