This patch, written by Jakub in PR 56076, avoids crashing in
libbacktrace if it sees a relative file name but did not see a
DW_AT_comp_dir attribute. Bootstrapped and ran libbacktrace testsuite
on x86_64-unknown-linux-gnu. Committed to mainline.
Ian
2013-01-25 Jakub Jelinek <ja...@redhat.com>
PR other/56076
* dwarf.c (read_line_header): Don't crash if DW_AT_comp_dir
attribute was not seen.
Index: dwarf.c
===================================================================
--- dwarf.c (revision 195436)
+++ dwarf.c (working copy)
@@ -1655,7 +1655,8 @@ read_line_header (struct backtrace_state
strnlen ((const char *) hdr_buf.buf, hdr_buf.left) + 1))
return 0;
dir_index = read_uleb128 (&hdr_buf);
- if (IS_ABSOLUTE_PATH (filename))
+ if (IS_ABSOLUTE_PATH (filename)
+ || (dir_index == 0 && u->comp_dir == NULL))
hdr->filenames[i] = filename;
else
{
