netdev - [PATCH net 0/2] net: two fixes for qdisc_pkt_len

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Message-ID: <20240924150257.1059524-1-edumazet@google.com>
Date: Tue, 24 Sep 2024 15:02:55 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org, 
	Willem de Bruijn <willemb@...gle.com>, Jonathan Davies <jonathan.davies@...anix.com>, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net 0/2] net: two fixes for qdisc_pkt_len_init()

Inspired by one syzbot report.

At least one qdisc (fq_codel) depends on qdisc_skb_cb(skb)->pkt_len
having a sane value (not zero)

With the help of af_packet, syzbot was able to fool qdisc_pkt_len_init()
to precisely set qdisc_skb_cb(skb)->pkt_len to zero.

First patch fixes this issue.

Second one (a separate one to help future bisections) adds
more sanity check to SKB_GSO_DODGY users.

Eric Dumazet (2):
  net: avoid potential underflow in qdisc_pkt_len_init() with UFO
  net: add more sanity checks to qdisc_pkt_len_init()

 net/core/dev.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

-- 
2.46.0.792.g87dc391469-goog