[Expat-bugs] [ expat-Bugs-830367 ] Multiple Calls to XML_ParserFree

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Bugs item #830367, was opened at 2003-10-26 01:25
Message generated for change (Comment added) made by kwaclaw
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Category: None
Group: None
>Status: Closed
>Resolution: Rejected
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Multiple Calls to XML_ParserFree

Initial Comment:
Version: 1.95.7

Calling XML_ParserFree on the same parser object 
multiple times causes an access violation error.

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>Comment By: Karl Waclawek (kwaclaw)
Date: 2003-10-26 13:31

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Closed - not a bug.

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Comment By: Karl Waclawek (kwaclaw)
Date: 2003-10-26 03:22

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However, your report made me see that XML_ParserFree()
is not null-safe, that is, it does not check its argument
for Null. Now, this is not the case you described, but if you
nulled every pointer that you freed, then you could pass the
same pointer variable to XML_ParserFree() again, and the
null test would prevent an access violation.

I just checked in a fix (xmlparse.c rev. 1.118).

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Comment By: Karl Waclawek (kwaclaw)
Date: 2003-10-26 02:54

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That is because you are not supposed to do that.
Just like you are not supposed to free any allocated memory 
more than once.

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