Issue #20453 has been updated by k0kubun (Takashi Kokubun). Backport changed from 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: REQUIRED, 3.3: REQUIRED to 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: REQUIRED, 3.3: DONE ruby_3_3 commit:cf643fabd5c564c1dfeb337b50b4aa76ebaa11c1 merged revision(s) commit:d292a9b98ce03c76dbe13138d20b9fbf613cc02d. ---------------------------------------- Bug #20453: Pointer being freed was not allocated in Regexp timeout https://bugs.ruby-lang.org/issues/20453#change-108505 * Author: dodecadaniel (Daniel Colson) * Status: Closed * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: REQUIRED, 3.3: DONE ---------------------------------------- https://bugs.ruby-lang.org/issues/20228 frees `stk_base` to avoid a memory leak, but `stk_base` is sometimes stack allocated ([see `xalloca`](https://github.com/ruby/ruby/blob/dde99215f2bc60c22a00fc941ff7f714f011e920/r...)). So the free only works if the regex stack grows enough that it needs to double ([see `xmalloc` and `xrealloc` in `stack_double`](https://github.com/ruby/ruby/blob/dde99215f2bc60c22a00fc941ff7f714f011e920/r...). Reproduction: ```ruby Regexp.timeout = 0.001 /^(a*)x$/ =~ "a" * 1000000 + "x"' ``` I'll open a PR shortly. https://bugs.ruby-lang.org/issues/20228 was backported to 3.3.1, so this bug affects that version as well. -- https://bugs.ruby-lang.org/