[PATCH] net/ice: add check for null-pointer dereference

[Bruce Richardson]

On Tue, Nov 19, 2024 at 11:57:15AM +0000, Stokes, Ian wrote:
> > Although it should never occur that the teid (scheduler node id) value
> > for a txq is incorrect, put in a check for null following the scheduler
> > node lookup in ice_tm_setup_txq_node. This provides some additional
> > safety and should eliminate a coverity issue too.
> > 
> > Coverity issue: 448957
> > Fixes: 715d449a965b ("net/ice: enhance Tx scheduler hierarchy support")
> > 
> > Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
> > ---
> >  drivers/net/ice/ice_tm.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/drivers/net/ice/ice_tm.c b/drivers/net/ice/ice_tm.c
> > index 18ac324a61..ff3a6cd77f 100644
> > --- a/drivers/net/ice/ice_tm.c
> > +++ b/drivers/net/ice/ice_tm.c
> > @@ -679,6 +679,10 @@ ice_tm_setup_txq_node(struct ice_pf *pf, struct
> > ice_hw *hw, uint16_t qid, uint32
> >  	struct ice_sched_node *hw_node = ice_sched_find_node_by_teid(hw-
> > >port_info->root, teid);
> >  	struct ice_tm_node *sw_node = find_node(pf->tm_conf.root, qid);
> > 
> > +	/* bad node teid passed */
> > +	if (hw_node == NULL)
> > +		return -ENOENT;
> > +
> >  	/* not configured in hierarchy */
> >  	if (sw_node == NULL)
> >  		return 0;
> 
> LGTM.
> 
> Acked-by: Ian Stokes <ian.stokes at intel.com>
> 
Applied to dpdk-next-net-intel.

/Bruce