I've hit a null pointer dereference in libdwarf when opening a particular
ELF file. The crash is in _dwarf_elf_relocate, specifically here:
http://sourceforge.net/p/elftoolchain/code/HEAD/tree/trunk/libdwarf/libdwarf_elf_init.c#l141
ed->ed_data->d_buf is NULL here. I single stepped with gdb and found that
this can from elf_getdata() returning a non-NULL ed_data with d_buf is set
to NULL at this line:
http://sourceforge.net/p/elftoolchain/code/HEAD/tree/trunk/libelf/elf_data.c#l143
I have no idea where to go from here. My test app source can be found here:
https://people.freebsd.org/~rstone/libdwarf_crash/crash.c
A sample ELF file that provokes the crash can be found here:
https://people.freebsd.org/~rstone/libdwarf_crash/dwarf_crash.ko.debug
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