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net: page_pool: sanitise allocation order

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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@gmail.com>
Reviewed-by: Mina Almasry <almasrymina@google.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://patch.msgid.link/77ad83c1aec66cbd00e7b3952f74bc3b7a988150.1764542851.git.asml.silence@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pavel Begunkov
2025-11-30 23:35:17 +00:00
committed by Jakub Kicinski
parent 854858848b
commit 9954464d73
1 changed files with 3 additions and 0 deletions
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3
net/core/page_pool.c
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@@ -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;