Issue #13121 has been reported by Tomoyuki Chikanaga.

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Bug #13121: Backport r57108 (fix memory corruption by width underflow)
https://bugs.ruby-lang.org/issues/13121

* Author: Tomoyuki Chikanaga
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: -
* Backport: 2.2: UNKNOWN, 2.3: REQUIRED, 2.4: REQUIRED
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