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There was also a bug in the Linux kernel, or did I miss something?

Yes there was. It's detailed in the article.

But why wouldn't have happened with Rust? Sorry I can't find anything about Rust in the article. Or you mean if the Linux kernel was written in Rust and that stupid bool coercion was not possible?

It's the latter; Rust won't allow the int->bool coercion.

Though to be absolutely pedantic, !x is an int for x:int in C, there is no bool coercion involved; an if-statement takes an expression of any scalar value and evals to true on non-zero. Not that that helps to avoid introducing bugs anyway.

Because Rust programmers would have used an enum or Result.

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