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Date:   Mon, 28 Dec 2020 14:54:01 -0800 (PST)
From:   David Miller <>
Subject: Re: [PATCH -net] net: sched: prevent invalid Scell_log shift count

From: Randy Dunlap <>
Date: Thu, 24 Dec 2020 22:23:44 -0800

> Check Scell_log shift size in red_check_params() and modify all callers
> of red_check_params() to pass Scell_log.
> This prevents a shift out-of-bounds as detected by UBSAN:
>   UBSAN: shift-out-of-bounds in ./include/net/red.h:252:22
>   shift exponent 72 is too large for 32-bit type 'int'
> Fixes: 8afa10cbe281 ("net_sched: red: Avoid illegal values")
> Signed-off-by: Randy Dunlap <>
> Reported-by:

Applied and queued up for -stable, thanks.

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