[physfs] physfs corruption (double free) in hardened version

[Ryan C. Gordon]

> I have attached a test program of a bug submitter, with that physfs
> crashs, because of a double free exception, on amd64 (but not on i386).

I can't reproduce this; Valgrind reports no double free errors, and 
glibc does not panic about a double-free as was indicated.

I build this on amd64 with physfs-2.0.2 and gcc "version 4.4.5 
(Ubuntu/Linaro 4.4.4-14ubuntu5)", made a testdir directory and put two 
dummy files in it.

gcc -O0 -ggdb3 -o bug bug.c -I.. ./libphysfs.a -lz -std=c99

bug.c correctly gets a list of the two dummy files, and then 
successfully frees that list without a double-free. If I add a call to 
PHYSFS_deinit() at the end, there isn't even a single memory leak in the 
whole program.

Perhaps the problem is elsewhere?

(Granted, I'm not building this "hardened" ... if you give me 
instructions for that, I'll try it.)

--ryan.