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From 6daa986c7fdf27835a0f5d897c88f6b8dc42b8db Mon Sep 17 00:00:00 2001
From: Andrea Marchesini <amarchesini@mozilla.com>
Date: Thu, 4 Jun 2015 15:04:10 +0100
Subject: [PATCH] Bug 1167888 - Better string length check in
nsZipArchive::BuildFileList. r=smaug, a=dveditz
--HG--
extra : transplant_source : %5E6%3E%84%B6a%7F%1F%D21zGc%BD%E1%80%EF%0C%B5%F0
---
modules/libjar/nsZipArchive.cpp | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/modules/libjar/nsZipArchive.cpp b/modules/libjar/nsZipArchive.cpp
index cb3e5d0..f8af715 100644
--- a/modules/libjar/nsZipArchive.cpp
+++ b/modules/libjar/nsZipArchive.cpp
@@ -617,8 +617,13 @@ MOZ_WIN_MEM_TRY_BEGIN
if (!centralOffset)
return NS_ERROR_FILE_CORRUPTED;
- //-- Read the central directory headers
buf = startp + centralOffset;
+
+ // avoid overflow of startp + centralOffset.
+ if (buf < startp)
+ return NS_ERROR_FILE_CORRUPTED;
+
+ //-- Read the central directory headers
uint32_t sig = 0;
while (buf + int32_t(sizeof(uint32_t)) <= endp &&
(sig = xtolong(buf)) == CENTRALSIG) {
--
2.4.3
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