Re: dangling pointer bug and proposed patch

[Eric Blake]

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[moving discussion to m4-patches]

According to john on 1/18/2006 7:37 PM:
> Hello,
> 
> There is a dangling pointer bug in GNU m4, exposed by this example:
> 
> $ m4 -dqeat
> define(`f',`one')f(undefine(`f')`two')
> m4trace: -1- define(`f', `one')
> m4trace: -2- undefine(`f')
> m4trace: -1- øò·øò·(`two') -> `øò·øò·H'
> øò·øò·H

Thanks for catching that, and a great analysis of the issue!

Also, could you check if the bug is still present on CVS head?

> 
> A patch for the proposed fix against m4-1.4.4 is also attached.
> (The branch name m4-1.4.4.1 is just for my own convenience.)

Unfortunately, the patch is too big to be considered trivial; are you
willing to assign copyright to the FSF?  This is a legal necessity before
your patch can be applied.

- --
Life is short - so eat dessert first!

Eric Blake             address@hidden
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