Bug #14756: `Exception` may cause SEGV when `#backtrace` returns a string

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.6.0dev (2018-05-13 trunk 63413) [x86_64-linux]
• Backport: 2.3: REQUIRED, 2.4: DONE, 2.5: DONE

[yui-knk (Kaneko Yuichiro)]

This code causes SEGV, because print_backtrace expects second argument to be an array but a string is given.

class Exception
  def backtrace
    "backtrace"
  end
end

"".a

Also in ruby 2.3.7, 2.4.4, 2.5.1.

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset trunk|r63417.

---

error.c: check redefined backtrace result

• error.c (rb_get_backtrace): check the result of backtrace even
  if the method is redefined. [ruby-core:87013] [Bug #14756]

[yui-knk (Kaneko Yuichiro)]

• Backport changed from 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN to 2.3: REQUIRED, 2.4: REQUIRED, 2.5: REQUIRED

[usa (Usaku NAKAMURA)]

• Backport changed from 2.3: REQUIRED, 2.4: REQUIRED, 2.5: REQUIRED to 2.3: REQUIRED, 2.4: DONE, 2.5: REQUIRED

ruby_2_4 r64147 merged revision(s) 63417.

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.3: REQUIRED, 2.4: DONE, 2.5: REQUIRED to 2.3: REQUIRED, 2.4: DONE, 2.5: DONE

ruby_2_5 r64430 merged revision(s) 63417.