[Bug gdb/13259] New: gdb sometimes crashes with SIGSEGV whenprinting variables

["martin.runge at web dot de" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13259

             Bug #: 13259
           Summary: gdb sometimes crashes with SIGSEGV when printing
                    variables
           Product: gdb
           Version: 7.3
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
        AssignedTo: unassigned@sourceware.org
        ReportedBy: martin.runge@web.de
    Classification: Unclassified


When trying to print a variable's value, gdb can crash with NULL pointer deref
in some cases here:

gdb/varobj.c   (line 2643 in gdb 7.3.1)


static char *
value_get_print_value (struct value *value, enum varobj_display_formats format,
               struct varobj *var)

....
  else if (string_print)
    val_print_string (type, encoding, str_addr, len, stb, &opts); 
....

I have seen some cases, where "type" was still NULL, but "string_print" != 0.

I think val_print_string should only be called, if "type" was resolved before.
If type is still NULL, use val_print_common instead.

I'll send a patch to gdb-patches.

Seen in 7.3.0, 7.3.1 and still present in current snapshot 20111005.

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