[Expat-bugs] [ expat-Bugs-620343 ] segfault: bad API/callback interaction

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Bugs item #620343, was opened at 2002-10-08 12:50
You can respond by visiting: 
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Fred L. Drake, Jr. (fdrake)
Assigned to: Fred L. Drake, Jr. (fdrake)
Summary: segfault: bad API/callback interaction

Initial Comment:
There is a bad interaction between the call to the
start element handler and the Expat API:  After the
presence of the callback is checked, the addBinding()
function can call XML_SetStartElementHandler(parser,
NULL), after which doContent() will still attempt to
call the start element handler.  This results in a call
to the NULL address, resulting in a memory fault.

This is unlikely to be an issue for applications
written entirely in C, but can reasonably happen when a
wrapper library clears callbacks when an error
condition or exception has been detected.

I've attached a patch and a regression test for this case.


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