PR22209, invalid memory read in find_abstract_instance_name
authorAlan Modra <amodra@gmail.com>
Tue, 26 Sep 2017 12:17:24 +0000 (21:47 +0930)
committerAlan Modra <amodra@gmail.com>
Tue, 26 Sep 2017 12:42:40 +0000 (22:12 +0930)
commit1b86808a86077722ee4f42ff97f836b12420bb2a
tree62f8285b0a6a9b19614741d136da2038311ff8f4
parent5c1c468d0eddd0fda1ec8c5f33888657f94e3266
PR22209, invalid memory read in find_abstract_instance_name

This patch adds bounds checking for DW_FORM_ref_addr die refs, and
calculates them relative to the first .debug_info section.  See the
big comment for why calculating relative to the current .debug_info
section was wrong for relocatable object files.

PR 22209
* dwarf2.c (struct comp_unit): Delete sec_info_ptr field.
(find_abstract_instance_name): Calculate DW_FORM_ref_addr relative
to stash->info_ptr_memory, and check die_ref is within that memory.
Set info_ptr_end correctly when another CU is refd.  Check die_ref
for DW_FORM_ref4 etc. is within CU.
bfd/ChangeLog
bfd/dwarf2.c