From 73d299adf08136f2fee37aec4e8cd739bc54743a Mon Sep 17 00:00:00 2001
From: wanghang <wanghang26@huawei.com>
Date: Mon, 15 Aug 2022 11:25:44 +0800
Subject: [PATCH] fixed ae3b7fc from
 https://gitee.com/small_bricklayer/third_party_zlib/pulls/42 IssueNo:#I5MAFM
 Description:security: Fix CVE-2022-37434 Sig:SIG_ApplicaitonFramework Feature
 or Bugfix:Bugfix Binary Source:No

Signed-off-by: wanghang <wanghang26@huawei.com>
Change-Id: If307873d4eeb639f4c86ac7ca4dd2057e9522070
---
 inflate.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/inflate.c b/inflate.c
index 7be8c63..2a3c4fe 100644
--- a/inflate.c
+++ b/inflate.c
@@ -764,8 +764,9 @@ int flush;
                 if (copy > have) copy = have;
                 if (copy) {
                     if (state->head != Z_NULL &&
-                        state->head->extra != Z_NULL) {
-                        len = state->head->extra_len - state->length;
+                        state->head->extra != Z_NULL &&
+                        (len = state->head->extra_len - state->length) <
+                            state->head->extra_max) {
                         zmemcpy(state->head->extra + len, next,
                                 len + copy > state->head->extra_max ?
                                 state->head->extra_max - len : copy);