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Date:   Sat, 29 Oct 2022 08:35:11 -0700
From:   Eric Dumazet <>
To:     Ziyang Xuan <>
Subject: Re: [PATCH net v2] net: tun: fix bugs for oversize packet when napi
 frags enabled

On Sat, Oct 29, 2022 at 2:41 AM Ziyang Xuan
<> wrote:
> Recently, we got two syzkaller problems because of oversize packet
> when napi frags enabled.
> One of the problems is because the first seg size of the iov_iter
> from user space is very big, it is 2147479538 which is bigger than
> the threshold value for bail out early in __alloc_pages(). And
> skb->pfmemalloc is true, __kmalloc_reserve() would use pfmemalloc
> reserves without __GFP_NOWARN flag. Thus we got a warning as following:

Reviewed-by: Eric Dumazet <>

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