From: Ido Schimmel <idosch@nvidia.com>
To: Yuyang Huang <sigefriedhyy@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>,
David Ahern <dsahern@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Simon Horman <horms@kernel.org>,
Stefano Brivio <sbrivio@redhat.com>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
stable@vger.kernel.org
Subject: Re: [PATCH net] ipv6: use RCU iterator to dump route exceptions
Date: Mon, 17 Aug 2026 11:48:49 +0300 [thread overview]
Message-ID: <20260817084849.GA283708@shredder> (raw)
In-Reply-To: <20260815084651.69477-1-sigefriedhyy@gmail.com>
On Sat, Aug 15, 2026 at 05:46:51PM +0900, Yuyang Huang wrote:
> rt6_nh_dump_exceptions() uses hlist_for_each_entry() to iterate over
> RCU-protected exception lists. The caller holds rcu_read_lock(), but does
> not hold rt6_exception_lock, so rt6_insert_exception() can concurrently
> add an entry with hlist_add_head_rcu().
[...]
> Use hlist_for_each_entry_rcu() to safely iterate over the exception list.
>
> Fixes: 1e47b4837f3b ("ipv6: Dump route exceptions if requested")
> Cc: stable@vger.kernel.org
> Signed-off-by: Yuyang Huang <sigefriedhyy@gmail.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
I don't think this deserves a stable tag as it only silences a KCSAN
splat, but it's trivial to backport, so OK.
prev parent reply other threads:[~2026-08-17 8:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-15 8:46 Yuyang Huang
2026-08-16 11:26 ` Stefano Brivio
2026-08-17 8:48 ` Ido Schimmel [this message]
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