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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/18021] Segfault in dwarf2_add_member_fn
Date: Mon, 23 Mar 2015 22:17:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=18021

--- Comment #5 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Keith Seitz <kseitz@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=7e993ebf2343a5b39d6d1df29fdebc2818064ae5

commit 7e993ebf2343a5b39d6d1df29fdebc2818064ae5
Author: Keith Seitz <keiths@redhat.com>
Date:   Fri Feb 27 09:55:07 2015 -0800

    PR gdb/18021 - defend against "static virtual" methods

    This bug appears to be caused by bad debuginfo. The method
    causing the sefault in the reporter's test case is marked both static
    and virtual.

    This patch simply safegaurds against this case in dwarf2_add_member_fn,
    where the code assumes that there is a `this' pointer when a virtual method
    is seen (more specifically, when DW_AT_vtable_elem is seen).

    It previously dereferenced the first formal parameter
    (`this' pointer), which in this case doesn't exist. GDB consequently
    segfaulted dereferencing a NULL pointer.

    gdb/ChangeLog
        PR gdb/18021
        * dwarf2read.c (dwarf2_add_member_fn): Issue a complaint
        if we find a static method with DW_AT_vtable_elem_location.

    gdb/testsuite/ChangeLog
        PR gdb/18021
        * gdb.dwarf2/staticvirtual.exp: New test.

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