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From 5a8d121a1f3ef5ad7c105ee378cc79a3eac0c7d4 Mon Sep 17 00:00:00 2001
From: Rishi <rishi_devan@mail.com>
Date: Wed, 15 Jul 2020 13:51:00 +0200
Subject: [PATCH] bpo-39017: Avoid infinite loop in the tarfile module
(GH-21454)
Avoid infinite loop when reading specially crafted TAR files using the tarfile module
(CVE-2019-20907).
---
Lib/tarfile.py | 2 ++
diff --git a/Lib/tarfile.py b/Lib/tarfile.py
index e2b60532f6..6769066cab 100755
--- a/Lib/tarfile.py
+++ b/Lib/tarfile.py
@@ -1249,6 +1249,8 @@ class TarInfo(object):
length, keyword = match.groups()
length = int(length)
+ if length == 0:
+ raise InvalidHeaderError("invalid header")
value = buf[match.end(2) + 1:match.start(1) + length - 1]
# Normally, we could just use "utf-8" as the encoding and "strict"
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