Index: Lib/gzip.py
===================================================================
RCS file: /cvsroot/python/python/dist/src/Lib/gzip.py,v
retrieving revision 1.43
diff -u -r1.43 gzip.py
--- Lib/gzip.py	3 Mar 2005 08:35:21 -0000	1.43
+++ Lib/gzip.py	8 Mar 2005 13:49:27 -0000
@@ -282,7 +282,12 @@
             # this member, and read a new gzip header.
             # (The number of bytes to seek back is the length of the unused
             # data, minus 8 because _read_eof() will rewind a further 8 bytes)
-            self.fileobj.seek( -len(self.decompress.unused_data)+8, 1)
+            rewind = -len(self.decompress.unused_data)+8
+            if rewind > 0:
+                # too few unused data encountered, assume EOF
+                errmsg = "Unexpected EOF: %r" % self.decompress.unused_data
+                raise EOFError, errmsg
+            self.fileobj.seek(rewind, 1)
 
             # Check the CRC and file size, and set the flag so we read
             # a new member on the next call