The documentation for `rb_enc_interned_str_cstr` notes that `enc` can be
a null pointer, but this currently causes a segmentation fault when
trying to autoload the encoding. This commit fixes the issue by checking
for NULL before calling `rb_enc_autoload`.
This removes the related tests, and puts the related specs behind
version guards. This affects all code in lib, including some
libraries that may want to support older versions of Ruby.
The buffer deduplication codepath in rb_fstring can be used to free the buffer
of shared string roots, which leads to use-after-free.
Introudce a new flag to tag strings that at one point have been a shared root.
Check for it in rb_fstring to avoid freeing buffers that are shared by
multiple strings. This change is based on nobu's idea in [ruby-core:94838].
The included test case test for the sequence of calls to internal functions
that lead to this bug. See attached ticket for Ruby level repros.
[Bug #16151]
When you change this to true, you may need to add more tests.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53141 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* string.c (fstr_update_callback): pool bare strings only.
* string.c (rb_fstring): return the original string with sharing a
fstring if it has extra attributes, not the fstring itself.
[ruby-dev:49188] [Bug #11386]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51360 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
