From 6f109c5fbca1ffe0af2d2a98fc8ce96f412565db Mon Sep 17 00:00:00 2001
From: Moonchild <moonchild@palemoon.org>
Date: Thu, 26 Feb 2026 07:51:57 +0100
Subject: [PATCH] [libjar] Throw when we know a file was truncated.

---
 modules/libjar/nsZipArchive.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/modules/libjar/nsZipArchive.cpp b/modules/libjar/nsZipArchive.cpp
index 1ee3839baa..e5cf18d9e6 100644
--- a/modules/libjar/nsZipArchive.cpp
+++ b/modules/libjar/nsZipArchive.cpp
@@ -310,6 +310,8 @@ MOZ_WIN_MEM_TRY_BEGIN
       mFileData = mFileStart + headerSize;
       return NS_OK;
     }
+    // If we get here, the file was truncated.
+    return NS_ERROR_FILE_CORRUPTED;
   }
   mLen = mTotalLen;
   mFileData = mFileStart;