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Subject: [Bug corefiles/14983] New: GDB 7.5.1 crash due to NULL pointer
 reference at -break-insert
Date: Wed, 26 Dec 2012 20:13:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=14983

             Bug #: 14983
           Summary: GDB 7.5.1 crash due to NULL pointer reference at
                    -break-insert
           Product: gdb
           Version: 7.5
            Status: NEW
          Severity: critical
          Priority: P2
         Component: corefiles
        AssignedTo: unassigned@sourceware.org
        ReportedBy: forum@emblocks.org
    Classification: Unclassified


File: dwarf2read.c
Function:  process_full_comp_unit

Original:

  static_block = end_symtab_get_static_block (highpc + baseaddr, objfile, 0);

  /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
     Also, DW_AT_ranges may record ranges not belonging to any child DIEs
     (such as virtual method tables).  Record the ranges in STATIC_BLOCK's
     addrmap to help ensure it has an accurate map of pc values belonging to
     this comp unit.  */

  dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
  symtab = end_symtab_from_static_block (static_block, objfile,
                                           SECT_OFF_TEXT (objfile), 0);

The pointer static_block can be NULL while iterating through the symbols. this
will cause a crash of GDB.

I have this patched by:

  static_block = end_symtab_get_static_block (highpc + baseaddr, objfile, 0);

  /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
     Also, DW_AT_ranges may record ranges not belonging to any child DIEs
     (such as virtual method tables).  Record the ranges in STATIC_BLOCK's
     addrmap to help ensure it has an accurate map of pc values belonging to
     this comp unit.  */

  // NOTE (Gerard#1#): Bug fix!!!!!!
  symtab = NULL; 
  if(static_block ) 
  {
        dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);

        symtab = end_symtab_from_static_block (static_block, objfile,
                                                SECT_OFF_TEXT (objfile), 0);
  }

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