forked from mirrors/nixpkgs
a14859c686
Incluing the patch file in-tree because the upstream patch is not intended to apply for Python 2. Re #94004
25 lines
888 B
Diff
25 lines
888 B
Diff
From 5a8d121a1f3ef5ad7c105ee378cc79a3eac0c7d4 Mon Sep 17 00:00:00 2001
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From: Rishi <rishi_devan@mail.com>
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Date: Wed, 15 Jul 2020 13:51:00 +0200
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Subject: [PATCH] bpo-39017: Avoid infinite loop in the tarfile module
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(GH-21454)
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Avoid infinite loop when reading specially crafted TAR files using the tarfile module
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(CVE-2019-20907).
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---
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Lib/tarfile.py | 2 ++
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diff --git a/Lib/tarfile.py b/Lib/tarfile.py
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index e2b60532f6..6769066cab 100755
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--- a/Lib/tarfile.py
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+++ b/Lib/tarfile.py
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@@ -1249,6 +1249,8 @@ class TarInfo(object):
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length, keyword = match.groups()
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length = int(length)
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+ if length == 0:
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+ raise InvalidHeaderError("invalid header")
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value = buf[match.end(2) + 1:match.start(1) + length - 1]
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# Normally, we could just use "utf-8" as the encoding and "strict"
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