[Bug binutils/22209] invalid memory read in find_abstract_instance_name

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=22209

--- Comment #4 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot 
gnu.org> ---
The master branch has been updated by Alan Modra <address@hidden>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=1b86808a86077722ee4f42ff97f836b12420bb2a

commit 1b86808a86077722ee4f42ff97f836b12420bb2a
Author: Alan Modra <address@hidden>
Date:   Tue Sep 26 21:47:24 2017 +0930

    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.

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