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CVE-2022-3586: sch_sfb: Don't assume the skb is still around after enqueueing to child · torvalds/linux@9efd232

A flaw was found in the Linux kernel’s networking code. A use-after-free was found in the way the sch_sfb enqueue function used the socket buffer (SKB) cb field after the same SKB had been enqueued (and freed) into a child qdisc. This flaw allows a local, unprivileged user to crash the system, causing a denial of service.

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sch_sfb: Don’t assume the skb is still around after enqueueing to child

The sch_sfb enqueue() routine assumes the skb is still alive after it has been enqueued into a child qdisc, using the data in the skb cb field in the increment_qlen() routine after enqueue. However, the skb may in fact have been freed, causing a use-after-free in this case. In particular, this happens if sch_cake is used as a child of sfb, and the GSO splitting mode of CAKE is enabled (in which case the skb will be split into segments and the original skb freed).

Fix this by copying the sfb cb data to the stack before enqueueing the skb, and using this stack copy in increment_qlen() instead of the skb pointer itself.

Reported-by: [email protected] # ZDI-CAN-18231 Fixes: e13e02a (“net_sched: SFB flow scheduler”) Signed-off-by: Toke Høiland-Jørgensen [email protected] Signed-off-by: David S. Miller [email protected]

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