From 955b06fa576df1a6954263043ea3f3a5b9ad5940 Mon Sep 17 00:00:00 2001 From: Sergio Durigan Junior Date: Wed, 29 May 2019 10:36:57 -0400 Subject: [PATCH] Don't crash is dwarf_decode_macro_bytes's 'body' is NULL, even when '!is_define' Ref.: https://bugzilla.redhat.com/show_bug.cgi?id=1715008 On commit 7bede82892a06e6c26989803e70f53697392dcf9 ("Don't crash if dwarf_decode_macro_bytes's 'body' is NULL"), I was too strict when checking if 'body' is NULL: the check only comprised the case when 'is_define' is true. However, the corruption of .debug_macro by rpmbuild's "debugedit" also affects the case when 'is_define' is false, i.e., when the macro is being undefined. This commit improves the check and covers both cases now. This has been tested on Fedora 30 with a problematic debuginfo, and I don't see a segfault anymore. OK to push? gdb/ChangeLog: 2019-05-29 Sergio Durigan Junior Ref.: https://bugzilla.redhat.com/show_bug.cgi?id=1708192 Ref.: https://bugzilla.redhat.com/show_bug.cgi?id=1715008 * dwarf2read.c (dwarf_decode_macro_bytes): Move check to see if 'body' is NULL to the outter 'if', protecting the '!is_define' situation as well. --- gdb/ChangeLog | 8 ++++++++ gdb/dwarf2read.c | 31 ++++++++++++++----------------- 2 files changed, 22 insertions(+), 17 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 37c0069e3f2..2ab3615be6e 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,11 @@ +2019-05-29 Sergio Durigan Junior + + Ref.: https://bugzilla.redhat.com/show_bug.cgi?id=1708192 + Ref.: https://bugzilla.redhat.com/show_bug.cgi?id=1715008 + * dwarf2read.c (dwarf_decode_macro_bytes): Move check to see if + 'body' is NULL to the outter 'if', protecting the '!is_define' + situation as well. + 2019-05-29 Tom Tromey * dwarf2read.c (partial_die_parent_scope): Call dwarf_tag_name. diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c index f47d130fa22..e1d6bb2d580 100644 --- a/gdb/dwarf2read.c +++ b/gdb/dwarf2read.c @@ -24648,25 +24648,22 @@ dwarf_decode_macro_bytes (struct dwarf2_cu *cu, is_define ? _("definition") : _("undefinition"), line == 0 ? _("zero") : _("non-zero"), line, body); - if (is_define) + if (body == NULL) { - if (body != NULL) - parse_macro_definition (current_file, line, body); - else - { - /* Fedora's rpm-build's "debugedit" binary - corrupted .debug_macro sections. - - For more info, see - https://bugzilla.redhat.com/show_bug.cgi?id=1708786 */ - complaint (_("debug info gives %s invalid macro definition " - "without body (corrupted?) at line %d" - "on file %s"), - at_commandline ? _("command-line") - : _("in-file"), - line, current_file->filename); - } + /* Fedora's rpm-build's "debugedit" binary + corrupted .debug_macro sections. + + For more info, see + https://bugzilla.redhat.com/show_bug.cgi?id=1708786 */ + complaint (_("debug info gives %s invalid macro %s " + "without body (corrupted?) at line %d " + "on file %s"), + at_commandline ? _("command-line") : _("in-file"), + is_define ? _("definition") : _("undefinition"), + line, current_file->filename); } + else if (is_define) + parse_macro_definition (current_file, line, body); else { gdb_assert (macinfo_type == DW_MACRO_undef -- 2.30.2