diff --git a/Doc/library/ipaddress.rst b/Doc/library/ipaddress.rst
index d55511611e5..fea172463d4 100644
--- a/Doc/library/ipaddress.rst
+++ b/Doc/library/ipaddress.rst
@@ -390,11 +390,13 @@ so to avoid duplication they are only documented for :class:`IPv4Network`.
 
    .. attribute:: network_address
 
-      The broadcast address for the network.
+      The network address for the network. The network address and the
+      prefix length together uniquely define a network.
 
    .. attribute:: broadcast_address
 
-      The broadcast address for the network.
+      The broadcast address for the network. Packets sent to the broadcast
+      address should be received by every host on the network.
 
    .. attribute:: host mask
 
diff --git a/Lib/gzip.py b/Lib/gzip.py
index 5bcfe6123af..b6656a933e8 100644
--- a/Lib/gzip.py
+++ b/Lib/gzip.py
@@ -413,8 +413,10 @@ class GzipFile(io.BufferedIOBase):
             if self.fileobj is None:
                 return b''
             try:
-                # 1024 is the same buffering heuristic used in read()
-                self._read(max(n, 1024))
+                # Ensure that we don't return b"" if we haven't reached EOF.
+                while self.extrasize == 0:
+                    # 1024 is the same buffering heuristic used in read()
+                    self._read(max(n, 1024))
             except EOFError:
                 pass
         offset = self.offset - self.extrastart
diff --git a/Lib/ipaddress.py b/Lib/ipaddress.py
index dfb59445aed..c9338c55f38 100644
--- a/Lib/ipaddress.py
+++ b/Lib/ipaddress.py
@@ -1330,10 +1330,6 @@ class IPv4Interface(IPv4Address):
     def __hash__(self):
         return self._ip ^ self._prefixlen ^ int(self.network.network_address)
 
-    @property
-    def prefixlen(self):
-        return self._prefixlen
-
     @property
     def ip(self):
         return IPv4Address(self._ip)
@@ -1708,7 +1704,7 @@ class _BaseV6:
         hex_str = '%032x' % ip_int
         parts = [hex_str[x:x+4] for x in range(0, 32, 4)]
         if isinstance(self, (_BaseNetwork, IPv6Interface)):
-            return '%s/%d' % (':'.join(parts), self.prefixlen)
+            return '%s/%d' % (':'.join(parts), self._prefixlen)
         return ':'.join(parts)
 
     @property
@@ -1946,10 +1942,6 @@ class IPv6Interface(IPv6Address):
     def __hash__(self):
         return self._ip ^ self._prefixlen ^ int(self.network.network_address)
 
-    @property
-    def prefixlen(self):
-        return self._prefixlen
-
     @property
     def ip(self):
         return IPv6Address(self._ip)
diff --git a/Lib/test/test_ipaddress.py b/Lib/test/test_ipaddress.py
index 061c8660732..09b4a5e4387 100644
--- a/Lib/test/test_ipaddress.py
+++ b/Lib/test/test_ipaddress.py
@@ -731,8 +731,8 @@ class IpaddrUnitTest(unittest.TestCase):
                          '2001:658:22a:cafe:ffff:ffff:ffff:ffff')
 
     def testGetPrefixlen(self):
-        self.assertEqual(self.ipv4_interface.prefixlen, 24)
-        self.assertEqual(self.ipv6_interface.prefixlen, 64)
+        self.assertEqual(self.ipv4_interface.network.prefixlen, 24)
+        self.assertEqual(self.ipv6_interface.network.prefixlen, 64)
 
     def testGetSupernet(self):
         self.assertEqual(self.ipv4_network.supernet().prefixlen, 23)
diff --git a/Misc/NEWS b/Misc/NEWS
index 92a4d798c44..53f62a0c71c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -81,8 +81,8 @@ Library
   constructor, objects in the ipaddress module no longer implement __index__
   (they still implement __int__ as appropriate)
 
-- Issue #15546: Fix handling of pathological input data in the read1() method of
-  the BZ2File, GzipFile and LZMAFile classes.
+- Issue #15546: Fix handling of pathological input data in the peek() and
+  read1() methods of the BZ2File, GzipFile and LZMAFile classes.
 
 - Issue #13052: Fix IDLE crashing when replace string in Search/Replace dialog
   ended with '\'. Patch by Roger Serwy.