[Bug-gforth] [bug #46988] Fix use of uninitalized memory

[Jasper Lievisse Adriaanse]

Follow-up Comment #4, bug #46988 (project gforth):

I can reproduce the crash 100% of the time:

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This GDB was configured as "amd64-unknown-openbsd5.9"...
Core was generated by `gforth-ditc'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/lib/libpthread.so.20.1...done.
Loaded symbols for /usr/lib/libpthread.so.20.1
Loaded symbols for /usr/obj/ports/gforth-0.7.3/gforth-0.7.3/gforth-ditc
Reading symbols from /usr/local/lib/libavcall.so.1.0...done.
Loaded symbols for /usr/local/lib/libavcall.so.1.0
Reading symbols from /usr/local/lib/libffi.so.1.2...done.
Loaded symbols for /usr/local/lib/libffi.so.1.2
Reading symbols from /usr/local/lib/libltdl.so.5.0...done.
Loaded symbols for /usr/local/lib/libltdl.so.5.0
Reading symbols from /usr/lib/libm.so.9.0...done.
Loaded symbols for /usr/lib/libm.so.9.0
Symbols already loaded for /usr/lib/libpthread.so.20.1
Reading symbols from /usr/lib/libc.so.84.2...done.
Loaded symbols for /usr/lib/libc.so.84.2
Reading symbols from /usr/libexec/ld.so...done.
Loaded symbols for /usr/libexec/ld.so
#0  0x00001e33f031ec7b in check_prims (symbols1=0x1e35fbc01000) at
./main.c:954
954       for (i=0; symbols1[i]!=0; i++)
(gdb) bt
#0  0x00001e33f031ec7b in check_prims (symbols1=0x1e35fbc01000) at
./main.c:954
#1  0x00001e33f031ef25 in gforth_loader (imagefile=0x1e3619f01100,
filename=0x1e33f0423970 "gforth.fi")
    at ./main.c:1860
#2  0x00001e33f031fdd1 in main (argc=15, argv=0x7f7ffffcf538,
env=0x7f7ffffcf5b8) at ./main.c:2323
(gdb) bt full
#0  0x00001e33f031ec7b in check_prims (symbols1=0x1e35fbc01000) at
./main.c:954
        i = 1536
#1  0x00001e33f031ef25 in gforth_loader (imagefile=0x1e3619f01100,
filename=0x1e33f0423970 "gforth.fi")
    at ./main.c:1860
        header = {base = 0x1e3619f01100 "", checksum = 16837413913267837873,
image_size = 140187732341696, 
  dict_size = 33208421971100, data_stack_size = 7165064483209180463,
fp_stack_size = 7435269714738113633, 
  return_stack_size = 3328212250303557478, locals_stack_size =
8245922036098215479, 
  boot_entry = 0x74720069662e6874, throw_entry = 0x1e0069662e68, unused1 =
33217707870848, 
  xt_base = 0x1e33f031f40a, data_stack_base = 0x7f7ffffcf330
"/usr/local/lib/gforth/0.7.3/gforth.fi", 
  fp_stack_base = 0x7f7ffffcf370 "0177177", return_stack_base = 0x1e33f0423970
"gforth.fi", 
  locals_stack_base = 0x1b8a3e9a00 <Address 0x1b8a3e9a00 out of bounds>}
        image = 0x7f7ffffcf803 "/usr/local/share/gforth/0.7.3:."
        imp = 0x1 <Address 0x1 out of bounds>
        magic = " 02177177 00"
        magic7 = 0 ' '
        preamblesize = 0
        data_offset = 0
        check_sum = 140187732341776
        ausize = 0
        charsize = 0
        cellsize = 3
        sizebyte = 7
#2  0x00001e33f031fdd1 in main (argc=15, argv=0x7f7ffffcf538,
env=0x7f7ffffcf5b8) at ./main.c:2323
        path = 0x7f7ffffcf7a1
".:/usr/local/lib/gforth/site-forth:/usr/local/share/gforth/site-forth:/usr/local/lib/gforth/0.7.3:/usr/local/share/gforth/0.7.3:."
        imagename = 0x1e33f0423970 "gforth.fi"
        image_file = (FILE *) 0x1e3619f01100
        image = 0x7f7ffffcf5b8 "177177"
        retvalue = 0
(gdb)

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