netdev - Re: [PATCH v3 net] net/sched: taprio: Limit TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME to INT

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Date: Mon, 31 Jul 2023 08:20:22 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, vinicius.gomes@...el.com, jhs@...atatu.com,
 xiyou.wangcong@...il.com, jiri@...nulli.us, vedang.patel@...el.com,
 kuni1840@...il.com, netdev@...r.kernel.org, syzkaller@...glegroups.com,
 pctammela@...atatu.com
Subject: Re: [PATCH v3 net] net/sched: taprio: Limit
 TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME to INT_MAX.

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <davem@...emloft.net>:

On Fri, 28 Jul 2023 17:07:05 -0700 you wrote:
> syzkaller found zero division error [0] in div_s64_rem() called from
> get_cycle_time_elapsed(), where sched->cycle_time is the divisor.
> 
> We have tests in parse_taprio_schedule() so that cycle_time will never
> be 0, and actually cycle_time is not 0 in get_cycle_time_elapsed().
> 
> The problem is that the types of divisor are different; cycle_time is
> s64, but the argument of div_s64_rem() is s32.
> 
> [...]

Here is the summary with links:
  - [v3,net] net/sched: taprio: Limit TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME to INT_MAX.
    https://git.kernel.org/netdev/net/c/e739718444f7

You are awesome, thank you!
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