[boost] [Boost-bugs] [ boost-Bugs-1686329 ] Usage of uninitialized data member

From: SourceForge.net (noreply_at_[hidden])
Date: 2007-03-22 16:55:59

Bugs item #1686329, was opened at 2007-03-22 13:55
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Category: serialization
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Robert Ramey (ramey)
Summary: Usage of uninitialized data member

Initial Comment:
In the attached test case, data member basic_iarchive_impl::moveable_objects_recent is used before being initialized.

More specifically, the first call to basic_iarchive_impl::reset_object_address occurs before the first assignment of basic_iarchive_impl::moveable_objects_recent takes place (in basic_iarchive_impl::load_object).

The usage of uninitialized data can be detected using a memory checker such as valgrind, or a debugging environment which sets uninitialized memory to distinctive values, such as Visual C++.

I found this problem in 1.33.1 but I had a look at the 1.34 code in cvs and it does not appear to be fixed.  

In a tentative fix I initialized moveable_objects_recent in the basic_iarchive_impl constructor (to zero). This seems to work but I am not sure it is the right solution.  

This problem still occurs if the extra "i++" in basic_iarchive_impl::reset_object_address present in 1.33.1 is taken out.

This bug seems to be triggered by serializing a map whose values contain vectors.

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