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Date:   Wed, 03 Apr 2019 21:41:31 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH] net-gro: Fix GRO flush when receiving a GSO packet.

From: Steffen Klassert <>
Date: Tue, 2 Apr 2019 08:16:03 +0200

> Currently we may merge incorrectly a received GSO packet
> or a packet with frag_list into a packet sitting in the
> gro_hash list. skb_segment() may crash in this case because
> the assumptions on the skb layout are not met in this case.
> The correct behaviour would be to flush the packet in the
> gro_hash list and send the received GSO packet directly
> afterwards. Commit d61d072e87c8e ("net-gro: avoid reorders")
> sets NAPI_GRO_CB(skb)->flush in this case, but this is not
> checked before merging. This patch makes sure to check this
> flag and to not merge in that case.
> Fixes: d61d072e87c8e ("net-gro: avoid reorders")
> Signed-off-by: Steffen Klassert <>

Applied and queued up for -stable, thanks.

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