Re: [PATCH] IB/rxe: Convert pr_info to pr_warn

[Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>]

On Wed, Jul 19, 2017 at 10:51:19AM +0300, Leon Romanovsky wrote:
> On Wed, Jul 19, 2017 at 10:11:50AM +0300, Moni Shoua wrote:
> > > How this code can be executed? IB/core ensures that port_num is in range.
> > > You can remove this check.
> > >
> > In this case ah_attr can come from the application and a validity
> > check is necessary.
> 
> It is a bug if it comes directly without rdma_is_port_valid() check in the
> IB/core. Currently modify_qp and create_ah are checking it and ensuring that
> user won't provide illegal port number.

Not sure i see the whole picture but something does not fit, will
appreciate a guidance here.

1. Application calls ibv_modify_qp which in turn fills out a cmd object and
"calls" ib_uverbs.ib_uverbs_modify_qp.
2. ib_uverbs_modify_qp copy the cmd from userspace and calls modify_qp.
3. modify_qp, among some other stuff, verifies port validity (which prove
your point) and calls driver's modify_qp hook (in our case rxe_modify_qp).

Is the above correct?

What i do not understand is the check that is done in step #2 since
port_num is not set when moving from state INIT to state RTR.
RXE on the other hands validate port_num only when needed (mask &
IB_QP_AV).

Looks like the check in step #2 is wrong.
What am i missing here?

Yuval

> 
> Thanks


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