From ad1747255880487be1dfd7d830ce7fd116e171e1 Mon Sep 17 00:00:00 2001
From: Thomas Lam <79589038+tl-hbk@users.noreply.github.com>
Date: Wed, 30 Jun 2021 16:18:21 -0500
Subject: [PATCH] Fix extract_zipped_paths infinite loop when provided invalid
 unc path

---
 requests/utils.py   | 3 +++
 tests/test_utils.py | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/requests/utils.py b/requests/utils.py
index db67938e67..b6d5c2ea0c 100644
--- a/requests/utils.py
+++ b/requests/utils.py
@@ -245,6 +245,9 @@ def extract_zipped_paths(path):
     archive, member = os.path.split(path)
     while archive and not os.path.exists(archive):
         archive, prefix = os.path.split(archive)
+        if not prefix:
+            # Needed to prevent infinite looping when provided invalid UNC path
+            break
         member = '/'.join([prefix, member])
 
     if not zipfile.is_zipfile(archive):
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 463516b2e5..98ffb25a6c 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -285,6 +285,10 @@ def test_zipped_paths_extracted(self, tmpdir):
         assert os.path.exists(extracted_path)
         assert filecmp.cmp(extracted_path, __file__)
 
+    def test_invalid_unc_path(self):
+        path = r"\\localhost\invalid\location"
+        assert extract_zipped_paths(path) == path
+
 
 class TestContentEncodingDetection: