linux-kernel - [PATCH net-next v5 1/6] net: page

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Message-ID: <126a5fbb2bfdfb1c3aa9421c0a8e22d8cc0af602.1760440268.git.asml.silence@gmail.com>
Date: Tue, 14 Oct 2025 14:01:21 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: netdev@...r.kernel.org,
	io-uring@...r.kernel.org
Cc: Michael Chan <michael.chan@...adcom.com>,
	Pavan Chebbi <pavan.chebbi@...adcom.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Simon Horman <horms@...nel.org>,
	Ilias Apalodimas <ilias.apalodimas@...aro.org>,
	Mina Almasry <almasrymina@...gle.com>,
	Pavel Begunkov <asml.silence@...il.com>,
	Willem de Bruijn <willemb@...gle.com>,
	Dragos Tatulea <dtatulea@...dia.com>,
	Saeed Mahameed <saeedm@...dia.com>,
	Tariq Toukan <tariqt@...dia.com>,
	Mark Bloch <mbloch@...dia.com>,
	David Wei <dw@...idwei.uk>,
	linux-kernel@...r.kernel.org,
	Stanislav Fomichev <stfomichev@...il.com>
Subject: [PATCH net-next v5 1/6] net: page_pool: sanitise allocation order

We're going to give more control over rx buffer sizes to user space, and
since we can't always rely on driver validation, let's sanitise it in
page_pool_init() as well. Note that we only need to reject over
MAX_PAGE_ORDER allocations for normal page pools, as current memory
providers don't need to use the buddy allocator and must check the order
on init.i

Suggested-by: Stanislav Fomichev <stfomichev@...il.com>
Reviewed-by: Mina Almasry <almasrymina@...gle.com>
Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 net/core/page_pool.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 1a5edec485f1..635c77e8050b 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -301,6 +301,9 @@ static int page_pool_init(struct page_pool *pool,
 		}
 
 		static_branch_inc(&page_pool_mem_providers);
+	} else if (pool->p.order > MAX_PAGE_ORDER) {
+		err = -EINVAL;
+		goto free_ptr_ring;
 	}
 
 	return 0;
-- 
2.49.0