From 4ec641f81717e19198fc6375cf06b514ac381ab9 Mon Sep 17 00:00:00 2001
From: jackey_1024 <jikui2@huawei.com>
Date: Sat, 20 Aug 2022 18:07:04 +0800
Subject: [PATCH] busybox: fix CVE-2022-30065

backport from upstream:
https://git.busybox.net/busybox/commit/?id=e63d7cdfdac78c6fd27e9e63150335767592b85e

Signed-off-by: jackey_1024 <jikui2@huawei.com>
---
 editors/awk.c       | 3 +++
 testsuite/awk.tests | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/editors/awk.c b/editors/awk.c
index 62cd019..66d2646 100644
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -3094,6 +3094,9 @@ static var *evaluate(node *op, var *res)
 
 		case XC( OC_MOVE ):
 			debug_printf_eval("MOVE\n");
+            /* make sure that we never return a temp var */
+            if (L.v == TMPVAR0)
+                L.v = res;
 			/* if source is a temporary string, jusk relink it to dest */
 			if (R.v == TMPVAR1
 			 && !(R.v->type & VF_NUMBER)
diff --git a/testsuite/awk.tests b/testsuite/awk.tests
index 64ca9fd..2200488 100755
--- a/testsuite/awk.tests
+++ b/testsuite/awk.tests
@@ -463,4 +463,10 @@ testing "awk \"cmd\" | getline" \
 	"HELLO\n" \
 	'' ''
 
+testing 'awk assign while test' \
+	"awk '\$1==\$1=\"foo\" {print \$1}'" \
+	"foo\n" \
+	"" \
+	"foo"
+
 exit $FAILCOUNT
-- 
2.25.1

