[ python-Bugs-847019 ] datetime.datetime initialization needs more strict checking

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Bugs item #847019, was opened at 2003-11-22 05:19
Message generated for change (Comment added) made by dubnerm
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Category: Python Library
Group: Python 2.3
Status: Open
Resolution: None
Priority: 7
Submitted By: Michael Dubner (dubnerm)
Assigned to: Guido van Rossum (gvanrossum)
Summary: datetime.datetime initialization needs more strict checking

Initial Comment:
Friend of mine wrote following program:
---------------------------------
import datetime
t=datetime.datetime('1995-03-25')
print t.ctime()
---------------------------------
This is obviously wrong code, but instead of reporting
this at second line python crashes on third line (with
ctime).

Info:
Using Python 2.3.2 on Windows 2000


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>Comment By: Michael Dubner (dubnerm)
Date: 2003-11-24 04:36

Message:
Logged In: YES 
user_id=39274

Of cause i've seen that backdoor, but from my point of view
constructor is not so time-critical that insertion of sanity
chechs will slow down in most (sane) scenarios.

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Comment By: Tim Peters (tim_one)
Date: 2003-11-22 06:16

Message:
Logged In: YES 
user_id=31435

LOL!  Assigned to Guido for his amusement.  One string 
argument of exactly size 10 triggers the "secret" backdoor to 
construct a datetime.datetime from a pickle.  The datetime 
constructed here is insane, and provokes Microsoft's library 
into crashing.  In a debug build, it triggers an assertion error 
in the datetime module:

>>> import datetime
[16122 refs]
>>> datetime.datetime('1995-03-25')
datetime.datetime(12601, 57, 53, 45, 48, 51, 2961973)
[16124 refs]
>>> _.ctime()
Assertion failed: month <= 12, file 
C:\Code\python\Modules\datetimemodule.c, line 189

Boosted priority since it's a way to crash the interpreter on 
Windows.

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