Re: use-after-free in srpt_enable_tpg()

[Bart Van Assche <bvanassche@acm.org>]

On 6/30/22 18:59, Hillf Danton wrote:
> That hang can be skipped by removing the wait loop in
> srpt_release_sport() - in the direction of 9b64f7d0bb0a, sdev will not
> go home if any sport's refcount does not drop on ground. To do that, add
> port refcount to sdev in the diff below in bid to resurrect 9b64f7d0bb0a.
> 
> Then gc work can be added for dying sports to drop tpg after delaying a second.

I'm afraid that the patch from your email will lead to a use-after-free 
of sdev->pd. As long as a session is live the ch->qp pointer may be 
dereferenced. The sdev->pd pointer is stored in the pd member of struct 
ib_qp and hence may be dereferenced by any function that uses ch->qp.

Thanks,

Bart.