netdev - Re: [PATCH v1 net-next] ipv4: fib: Annotate access to struct fib_alias.fa

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Message-ID: <aXpGULHCDALVFA02@horms.kernel.org>
Date: Wed, 28 Jan 2026 17:24:32 +0000
From: Simon Horman <horms@...nel.org>
To: Kuniyuki Iwashima <kuniyu@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org,
	syzbot+d24f940f770afda885cf@...kaller.appspotmail.com
Subject: Re: [PATCH v1 net-next] ipv4: fib: Annotate access to struct
 fib_alias.fa_state.

On Tue, Jan 27, 2026 at 04:35:24AM +0000, Kuniyuki Iwashima wrote:
> syzbot reported that struct fib_alias.fa_state can be
> modified locklessly by RCU readers. [0]
> 
> Let's use READ_ONCE()/WRITE_ONCE() properly.

...

> value changed: 0x00 -> 0x01
> 
> Reported by Kernel Concurrency Sanitizer on:
> CPU: 1 UID: 0 PID: 4168 Comm: syz.4.206 Not tainted syzkaller #0 PREEMPT(voluntary)
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
> 
> Reported-by: syzbot+d24f940f770afda885cf@...kaller.appspotmail.com
> Closes: https://lore.kernel.org/netdev/69783ead.050a0220.c9109.0013.GAE@google.com/
> Signed-off-by: Kuniyuki Iwashima <kuniyu@...gle.com>

Reviewed-by: Simon Horman <horms@...nel.org>