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PR22186, divide-by-zero in decode_line_info

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PR 22186
	* dwarf2.c (decode_line_info): Fail on lh.line_range of zero
	rather than dividing by zero.
This commit is contained in:
Alan Modra
2017-09-24 14:36:48 +09:30
parent 515f23e63c
commit d8010d3e75
2 changed files with 8 additions and 0 deletions
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6
bfd/ChangeLog
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@ -1,3 +1,9 @@
2017-09-24 Alan Modra <amodra@gmail.com>
PR 22186
* dwarf2.c (decode_line_info): Fail on lh.line_range of zero
rather than dividing by zero.
2017-09-24 Alan Modra <amodra@gmail.com> 2017-09-24 Alan Modra <amodra@gmail.com>
PR 22169 PR 22169

2
bfd/dwarf2.c
View File

@ -2437,6 +2437,8 @@ decode_line_info (struct comp_unit *unit, struct dwarf2_debug *stash)
case DW_LNS_set_basic_block: case DW_LNS_set_basic_block:
break; break;
case DW_LNS_const_add_pc: case DW_LNS_const_add_pc:
if (lh.line_range == 0)
goto line_fail;
if (lh.maximum_ops_per_insn == 1) if (lh.maximum_ops_per_insn == 1)
address += (lh.minimum_instruction_length address += (lh.minimum_instruction_length
* ((255 - lh.opcode_base) / lh.line_range)); * ((255 - lh.opcode_base) / lh.line_range));