From ccdb16fc41e06adae8d1d1e6e861f6ff34ac6e62 Mon Sep 17 00:00:00 2001 From: Jim Wilson Date: Fri, 7 Apr 2000 18:36:04 +0000 Subject: Fix linker segfault that occured when linking ia64-linux kernel. * dwarf2.c (struct dwarf2_debug): New field dwarf_line_size. (decode_line_info): Set it. Report error if unit->line_offset is equal to or larger than it. --- bfd/dwarf2.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) (limited to 'bfd/dwarf2.c') diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c index 5710d1a..92397a2 100644 --- a/bfd/dwarf2.c +++ b/bfd/dwarf2.c @@ -102,6 +102,9 @@ struct dwarf2_debug { /* Buffer for decode_line_info. */ char *dwarf_line_buffer; + + /* Length of the loaded .debug_line section. */ + unsigned long dwarf_line_size; }; struct arange { @@ -783,7 +786,6 @@ decode_line_info (unit) if (! stash->dwarf_line_buffer) { asection *msec; - unsigned long size; msec = bfd_get_section_by_name (abfd, ".debug_line"); if (! msec) @@ -793,20 +795,31 @@ decode_line_info (unit) return 0; } - size = msec->_raw_size; - stash->dwarf_line_buffer = (char *) bfd_alloc (abfd, size); + stash->dwarf_line_size = msec->_raw_size; + stash->dwarf_line_buffer = (char *) bfd_alloc (abfd, stash->dwarf_line_size); if (! stash->dwarf_line_buffer) return 0; if (! bfd_get_section_contents (abfd, msec, stash->dwarf_line_buffer, 0, - size)) + stash->dwarf_line_size)) return 0; /* FIXME: We ought to apply the relocs against this section before we process it.... */ } + /* Since we are using un-relocated data, it is possible to get a bad value + for the line_offset. Validate it here so that we won't get a segfault + below. */ + if (unit->line_offset >= stash->dwarf_line_size) + { + (*_bfd_error_handler) (_("Dwarf Error: Line offset (%u) bigger than line size (%u)."), + unit->line_offset, stash->dwarf_line_size); + bfd_set_error (bfd_error_bad_value); + return 0; + } + table = (struct line_info_table*) bfd_alloc (abfd, sizeof (struct line_info_table)); table->abfd = abfd; -- cgit v1.1