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Date: Mon, 25 Oct 2021 14:43:55 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Jiasheng Jiang <jiasheng@...as.ac.cn> Cc: mingo@...hat.com, juri.lelli@...hat.com, vincent.guittot@...aro.org, dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2] sched: Fix implicit type conversion On Mon, Oct 25, 2021 at 12:19:37PM +0000, Jiasheng Jiang wrote: > The variable 'n' is defined as ULONG. However in the cpumask_next(), > it is used as INT. > That is vulnerable and may cause overflow. > For example, if the value of 'n' is (2^31 - 1), then it can pass the That would need nr_cpu_ids to be that large. How's that going to happen?
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