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Re: use-after free bug in hacked 4.16 kernel, related to fq_flow_dequeue

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Ben Greear <greearb@xxxxxxxxxxxxxxx> writes:

> This is from my hacked kernel, could be my fault. I thought the fq
> guys might want to know however...

Hmm, nothing obvious comes to mind; fq_flow_dequeue() just dequeues a
packet from the queue; it only has two memory derefs, to fq->lock and
flow->queue. Don't see why either of those should be freed at this
point.

Unless fq_adjust_removal() is being inlined, perhaps? Then I suppose the
flow->tin reference could be the problem, if the txq_info struct was
already freed; did you change anything around the handling of TXQs?

-Toke



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