libelf: Free and clear rawdata_base and zdata_base consistently
There could be a leak if a program called elf_strptr on a compressed
section, but the program never requests the (uncompressed) section data,
but does explicitly (re)compress that same section data.
Fix this by explicitly always freeing and clearing the zdata_base
and rawdata_base in __libelf_reset_rawdata and elf_compress. Also
clear zdata_base in elf_end so the pointer isn't indeterminate when
it is being used in a later comparison against rawdata_base.
* libelf/elf_compress.c (elf_compress): Explicitly free
zdata_base before clearing.
(__libelf_reset_rawdata): Free zdata_base if it isn't
(going to be) used for rawdata_base. Explicitly clear
rawdata_base and zdata_base after free.
* libelf/elf_end.c (elf_end): Clear zdata_base after free.
Signed-off-by: Mark Wielaard <mark@klomp.org>
2 files changed
