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Date:   Wed, 01 May 2019 22:31:27 -0400 (EDT)
From:   David Miller <>
Subject: Re: [PATCH net] udp: fix GRO packet of death

From: Eric Dumazet <>
Date: Wed,  1 May 2019 18:56:28 -0700

> syzbot was able to crash host by sending UDP packets with a 0 payload.
> TCP does not have this issue since we do not aggregate packets without
> payload.
> Since dev_gro_receive() sets gso_size based on skb_gro_len(skb)
> it seems not worth trying to cope with padded packets.
> Fixes: e20cf8d3f1f7 ("udp: implement GRO for plain UDP sockets.")
> Signed-off-by: Eric Dumazet <>
> Cc: Paolo Abeni <>
> Reported-by: syzbot <>

Ugh :(

Applied and queued up for -stable, thanks Eric.

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