linux-kernel - Re: [PATCH 6/6] irq: Potentially 'offset out of size' bug

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Message-ID: <87tuisd8sf.ffs@tglx>
Date:   Fri, 10 Sep 2021 12:28:16 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jiang Jiasheng <jiasheng@...as.ac.cn>
Cc:     linux-kernel@...r.kernel.org, Jiang Jiasheng <jiasheng@...as.ac.cn>
Subject: Re: [PATCH 6/6] irq: Potentially 'offset out of size' bug

On Fri, Sep 10 2021 at 03:26, Jiang Jiasheng wrote:
> The find_next_bit() use nr_irqs as size, and using it without
> any check might cause its returned value out of the size

Why exactly is this a problem? The return value has to be checked at the
call site anyway.

Thanks,

        tglx