From: Simon Horman <horms@kernel.org>
To: Mina Almasry <almasrymina@google.com>
Cc: "Alexander Lobakin" <aleksander.lobakin@intel.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"Toke Høiland-Jørgensen" <toke@redhat.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
"Jesper Dangaard Brouer" <hawk@kernel.org>,
"Ilias Apalodimas" <ilias.apalodimas@linaro.org>,
"David S. Miller" <davem@davemloft.net>,
"Eric Dumazet" <edumazet@kernel.org>,
"Paolo Abeni" <pabeni@redhat.com>,
"Kaifeng Wang" <kaifengw@google.com>,
"Dong Chenchen" <dongchenchen2@huawei.com>
Subject: Re: [PATCH net v1] net: page_pool: fix use-after-free in page_pool_recycle_ring_bulk()
Date: Sat, 26 Sep 2026 18:00:54 +0100 [thread overview]
Message-ID: <20260926170054.GZ13925@horms.kernel.org> (raw)
In-Reply-To: <20260925144127.1445667-1-almasrymina@google.com>
On Fri, Sep 25, 2026 at 02:41:11PM +0000, Mina Almasry wrote:
> With CONFIG_PAGE_POOL_STATS=y, page_pool_recycle_ring_bulk() updates
> the recycle stats after dropping the producer lock. If it just recycled
> the last inflight netmems of a pool being destroyed, page_pool_release()
> can pass its producer-lock barrier and free the pool before
> recycle_stat_add() runs.
>
> Commit fcc680a647ba7 ("page_pool: allow mixing PPs within one bulk")
> moved this stat update after the unlock. Commit 271683bb2cf32
> ("page_pool: Fix use-after-free in page_pool_recycle_in_ring") later
> added the barrier, but only fixed page_pool_recycle_in_ring(). Move
> the update back under the lock.
>
> Fixes: fcc680a647ba7 ("page_pool: allow mixing PPs within one bulk")
> Link: https://lore.kernel.org/r/179028939171.2160803.706522228583664641@kernel.org
> Cc: Kaifeng Wang <kaifengw@google.com>
> Cc: Dong Chenchen <dongchenchen2@huawei.com>
> Assisted-by: LLM
> Signed-off-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
next prev parent reply other threads:[~2026-09-26 17:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-25 14:41 [PATCH net v1] net: page_pool: fix use-after-free in page_pool_recycle_ring_bulk() Mina Almasry
2026-09-26 17:00 ` Simon Horman [this message]
2026-09-28 12:40 ` Toke Høiland-Jørgensen
2026-09-29 1:40 ` patchwork-bot+netdevbpf
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