Marshal.dump crashing

[WaveformDelta]

I have a build of mRuby using this gem that crashes on calls to Marshal.dump.

> o = [:one, :two, :three]
  => [:one, :two, :three]
> m = Marshal.dump(o)
Segmentation fault: 11

It crashes in line 27 of marshal.cpp, right in this code:

bool operator!=(mrb_value const& lhs, mrb_sym const sym) {
  return !mrb_symbol_p(lhs) || mrb_symbol(lhs) != sym;
}

I'm building for iOS and macOS, and the code has been working; I had not tried using dump until now.

[WaveformDelta]

Further research shows that dump does work in certain cases. For example

> o = ['one', 'two', 'three']
 => ["one", "two", "three"]
> Marshal.dump(o)
 => "\004\b[\b\"\bone\"\btwo\"\nthree"

It seems to work with string objects, but not other types of object.

[take-cheeze]

@WaveformDelta Thanks for the report. Somehow I accessed the memory address before checking the range. Should be fixed by #22 .

It would be helpful if you reported the version of mruby(release or git commit hash). I've tried in latest mruby and it didn't reproduced, though 1.3 reproduced this. Anyway thank you.

[WaveformDelta]

Thanks for the fix!! I'm actually running this against the current tip of stable, mRuby 1.3.0 (277391e1b2).

I also noticed you had an earlier fix for a memory access error in 30b949ce...I was curious: wouldn't it need the same fix on line 31 for the operator==?