diff options
| author | Sergio Durigan Junior <sergiodj@redhat.com> | 2019-05-29 10:36:57 -0400 |
|---|---|---|
| committer | Sergio Durigan Junior <sergiodj@redhat.com> | 2019-05-29 16:14:50 -0400 |
| commit | 955b06fa576df1a6954263043ea3f3a5b9ad5940 (patch) | |
| tree | 699963af53c6e152b5f3582c76fce0e53c25749b /gdb/dwarf2read.c | |
| parent | f49055a52f04f75b6560f304eb975128dd82ad68 (diff) | |
| download | gdb-955b06fa576df1a6954263043ea3f3a5b9ad5940.zip gdb-955b06fa576df1a6954263043ea3f3a5b9ad5940.tar.gz gdb-955b06fa576df1a6954263043ea3f3a5b9ad5940.tar.bz2 | |
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 <sergiodj@redhat.com>
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.
Diffstat (limited to 'gdb/dwarf2read.c')
| -rw-r--r-- | gdb/dwarf2read.c | 31 |
1 files changed, 14 insertions, 17 deletions
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c index f47d130..e1d6bb2 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 |