Re: branch-1_4 regexp coredump

[Eric Blake]

Eric Blake <ebb9 <at> byu.net> writes:

> 
> Karl's observation on bug-m4 that we had a bogus warning pointed out 
something 
> even more severe - we were reading uninitialized memory from the stack.  
> Depending on your hardware, you can get allocation failures, core dumps, and 
> possibly even arbitrary code execution.

I still need to work on this.  We have a memory leak (and have done, since m4 
0.75 when regexp was introduced), because re_search allocates memory in 
re_registers on success if we haven't done it ourselves.

-- 
Eric Blake