diff options
| author | Alan Modra <amodra@gmail.com> | 2019-10-09 00:07:29 +1030 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2019-10-09 00:20:28 +1030 |
| commit | 063c511bd79281f33fd33f0964541a73511b9e2b (patch) | |
| tree | 203f7f0c9a4d8e444d304afde27dc8552405c0ee /bfd/dwarf2.c | |
| parent | 6446511295653d9b18e940d1d4757ccbe358879e (diff) | |
PR25078, stack overflow in function find_abstract_instance
PR 25078
* dwarf2.c (find_abstract_instance): Delete orig_info_ptr, add
recur_count. Error on recur_count reaching 100 rather than
info_ptr matching orig_info_ptr. Adjust calls.
Diffstat (limited to 'bfd/dwarf2.c')
| -rw-r--r-- | bfd/dwarf2.c | 35 |
1 files changed, 17 insertions, 18 deletions
diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c index 575b082e1d..d39f4fdfe4 100644 --- a/bfd/dwarf2.c +++ b/bfd/dwarf2.c @@ -2812,13 +2812,13 @@ static bfd_boolean comp_unit_maybe_decode_line_info (struct comp_unit *, struct dwarf2_debug *); static bfd_boolean -find_abstract_instance (struct comp_unit * unit, - bfd_byte * orig_info_ptr, - struct attribute * attr_ptr, - const char ** pname, - bfd_boolean * is_linkage, - char ** filename_ptr, - int * linenumber_ptr) +find_abstract_instance (struct comp_unit *unit, + struct attribute *attr_ptr, + unsigned int recur_count, + const char **pname, + bfd_boolean *is_linkage, + char **filename_ptr, + int *linenumber_ptr) { bfd *abfd = unit->abfd; bfd_byte *info_ptr; @@ -2829,6 +2829,14 @@ find_abstract_instance (struct comp_unit * unit, struct attribute attr; const char *name = NULL; + if (recur_count == 100) + { + _bfd_error_handler + (_("DWARF error: abstract instance recursion detected")); + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + /* DW_FORM_ref_addr can reference an entry in a different CU. It is an offset from the .debug_info section, not the current CU. */ if (attr_ptr->form == DW_FORM_ref_addr) @@ -2962,15 +2970,6 @@ find_abstract_instance (struct comp_unit * unit, info_ptr, info_ptr_end); if (info_ptr == NULL) break; - /* It doesn't ever make sense for DW_AT_specification to - refer to the same DIE. Stop simple recursion. */ - if (info_ptr == orig_info_ptr) - { - _bfd_error_handler - (_("DWARF error: abstract instance recursion detected")); - bfd_set_error (bfd_error_bad_value); - return FALSE; - } switch (attr.name) { case DW_AT_name: @@ -2984,7 +2983,7 @@ find_abstract_instance (struct comp_unit * unit, } break; case DW_AT_specification: - if (!find_abstract_instance (unit, info_ptr, &attr, + if (!find_abstract_instance (unit, &attr, recur_count + 1, &name, is_linkage, filename_ptr, linenumber_ptr)) return FALSE; @@ -3200,7 +3199,7 @@ scan_unit_for_symbols (struct comp_unit *unit) case DW_AT_abstract_origin: case DW_AT_specification: - if (!find_abstract_instance (unit, info_ptr, &attr, + if (!find_abstract_instance (unit, &attr, 0, &func->name, &func->is_linkage, &func->file, |