[PATCH] wifi: mt76: mt7996: prevent uninit return in mt7996_mac_sta_add_links

[Dan Carpenter]

On Fri, Mar 21, 2025 at 06:14:49PM +0100, Lorenzo Bianconi wrote:
> > On Thu, Mar 20, 2025 at 08:19:14PM +0000, Qasim Ijaz wrote:
> > > If link_conf_dereference_protected() or mt7996_vif_link() 
> > > or link_sta_dereference_protected() fail the code jumps to
> > > the error_unlink label and returns ret which is uninitialised.
> > > 
> > > Fix this by setting err before jumping to error_unlink.
> > > 
> > > Fixes: c7e4fc362443 ("wifi: mt76: mt7996: Update mt7996_mcu_add_sta to MLO support")
> > > Fixes: dd82a9e02c05 ("wifi: mt76: mt7996: Rely on mt7996_sta_link in sta_add/sta_remove callbacks")
> > > Signed-off-by: Qasim Ijaz <qasdev00 at gmail.com>
> > > ---
> > >  drivers/net/wireless/mediatek/mt76/mt7996/main.c | 12 +++++++++---
> > >  1 file changed, 9 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/main.c b/drivers/net/wireless/mediatek/mt76/mt7996/main.c
> > > index 91c64e3a0860..78f7f1fc867e 100644
> > > --- a/drivers/net/wireless/mediatek/mt76/mt7996/main.c
> > > +++ b/drivers/net/wireless/mediatek/mt76/mt7996/main.c
> > > @@ -998,16 +998,22 @@ mt7996_mac_sta_add_links(struct mt7996_dev *dev, struct ieee80211_vif *vif,
> > >  			continue;
> > 
> > What about if the list is empty or we hit this continue on every link?
> 
> we will return 0 and I guess that's fine, agree?
> 

Fine by me?

regards,
dan carpenter