Bug #14150: ruby 2.5.0dev SEGV by rb_external_str_new_with_enc(NULL, 0, rb_usascii_encoding())

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.5.0dev (2017-12-02 trunk 60975) [x86_64-linux]
• Backport: 2.3: UNKNOWN, 2.4: UNKNOWN

[kubo (Takehiro Kubo)]

rb_external_str_new_with_enc(NULL, 0, rb_usascii_encoding()) gets segmentation fault in ruby 2.5.0-preview1 and ruby 2.5.0dev.
It returns an empty string in released versions.

I made test code which calls following functions.

1. rb_str_new(NULL, 0);
2. rb_external_str_new(NULL, 0);
3. rb_locale_str_new(NULL, 0);
4. rb_usascii_str_new(NULL, 0);
5. rb_utf8_str_new(NULL, 0);
6. rb_enc_str_new(NULL, 0, rb_usascii_encoding());
7. rb_external_str_new_with_enc(NULL, 0, rb_usascii_encoding());

The first 6 worked fine but the last only failed.

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset trunk|r60979.

---

string.c: fix rb_external_str_new_with_enc

• string.c (rb_external_str_new_with_enc): do not search non-ascii
  by NULL pointer. [ruby-core:84055] [Bug #14150]