linux-kernel - Re: [PATCH] ipv6: prevent a possible race condition with lifetimes

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Message-ID: <bd7f34a6-4974-c3db-0d41-497168fcd944@kernel.org>
Date:   Mon, 21 Feb 2022 20:02:35 -0700
From:   David Ahern <dsahern@...nel.org>
To:     Niels Dossche <niels.dossche@...nt.be>,
        "David S. Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipv6: prevent a possible race condition with lifetimes

On 2/20/22 10:54 AM, Niels Dossche wrote:
> valid_lft, prefered_lft and tstamp are always accessed under the lock
> "lock" in other places. Reading these without taking the lock may result
> in inconsistencies regarding the calculation of the valid and preferred
> variables since decisions are taken on these fields for those variables.
> 
> Signed-off-by: Niels Dossche <niels.dossche@...nt.be>
> ---
>  net/ipv6/addrconf.c | 2 ++
>  1 file changed, 2 insertions(+)
> 

Reviewed-by: David Ahern <dsahern@...nel.org>