Description of problem:
In dwfl_module.c, compare_modules() has a 64 bit bug. The function returns the
result of subtracting two addresses, which can be 64 bits long, but
compare_modules returns an int because it is a comparison function for qsort.
Comparing a main program module with a low address with a shared library mapped
at a high address can return a wrong value.

Version-Release number of selected component (if applicable):
elf-0.120

How reproducible:
This came up in Frysk when trying to find the source line of an address in a
program. The search failed beacuse the modules weren't ordered properly.

Additional info:

See attachment for fix.

I applied the patch in a bit cleaned up way to the upstream code.  It'll be
fixed in the next rawhide release.

This is fixed in 0.122.