From 52327340714621f2452fc62a6bcbbefda9f46ea7 Mon Sep 17 00:00:00 2001
From: olszomal <Malgorzata.Olszowka@stunnel.org>
Date: Wed, 29 May 2024 14:18:10 +0200
Subject: [PATCH] Fix fuzzer error - failed to sort central directory entry

---
 appx.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/appx.c b/appx.c
index 5db44bd..d66af5a 100644
--- a/appx.c
+++ b/appx.c
@@ -2323,6 +2323,12 @@ static ZIP_FILE *zipSortCentralDirectory(ZIP_FILE *zip)
     }
     sk_ZIP_CENTRAL_DIRECTORY_ENTRY_sort(chain);
     zip->centralDirectoryHead = entry = sk_ZIP_CENTRAL_DIRECTORY_ENTRY_value(chain, 0);
+    if (!entry) {
+        printf("Failed to get sorted central directory entry\n");
+        sk_ZIP_CENTRAL_DIRECTORY_ENTRY_free(chain);
+        freeZip(zip);
+        return NULL;
+    }
     for (i=1; i<sk_ZIP_CENTRAL_DIRECTORY_ENTRY_num(chain); i++) {
         entry->next = sk_ZIP_CENTRAL_DIRECTORY_ENTRY_value(chain, i);
         entry = entry->next;