On Wed, Sep 11, 2013 at 05:55:04AM -0400, Jason Wang wrote: > > > ----- Original Message ----- > > On Wed, Sep 11, 2013 at 04:24:05PM +0800, Jason Wang wrote: > > > Commit c8d68e6be1c3b242f1c598595830890b65cea64a (tuntap: multiqueue > > > support) > > > only call free_netdev() on err in tun_set_iff(). This causes several > > > issues: > > > > > > - memory of tun security were leaked > > > > Not just tun security - sock reference too (didn't detach) > > > > Yes, I mention it in the next item.
That line's a bit too long btw. Keep it under 70 chars for commit logs. > > > - use after free since the flow gc timer was not deleted and the tfile > > > were > > > not > > > detached > > > > > > This patch solves the above issues. > > > > > > Reported-by: Wannes Rombouts <wannes.rombo...@epitech.eu> > > > Cc: Michael S. Tsirkin <m...@redhat.com> > > > Signed-off-by: Jason Wang <jasow...@redhat.com> > > > --- > > > The patch were also needed for stable 3.8+. > > > --- > > > drivers/net/tun.c | 9 +++++++-- > > > 1 files changed, 7 insertions(+), 2 deletions(-) > > > > > > diff --git a/drivers/net/tun.c b/drivers/net/tun.c > > > index a639de8..e5fb5d3 100644 > > > --- a/drivers/net/tun.c > > > +++ b/drivers/net/tun.c > > > @@ -1641,11 +1641,11 @@ static int tun_set_iff(struct net *net, struct > > > file > > > *file, struct ifreq *ifr) > > > INIT_LIST_HEAD(&tun->disabled); > > > err = tun_attach(tun, file, false); > > > if (err < 0) > > > - goto err_free_dev; > > > + goto err_free_flow; > > > > > > err = register_netdevice(tun->dev); > > > if (err < 0) > > > - goto err_free_dev; > > > + goto err_detach; > > > > > > if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || > > > device_create_file(&tun->dev->dev, &dev_attr_owner) || > > > @@ -1689,6 +1689,11 @@ static int tun_set_iff(struct net *net, struct file > > > *file, struct ifreq *ifr) > > > strcpy(ifr->ifr_name, tun->dev->name); > > > return 0; > > > > > > +err_detach: > > > + tun_detach_all(dev); > > > +err_free_flow: > > > + tun_flow_uninit(tun); > > > + security_tun_dev_free_security(tun->security); > > > > This bit looks wrong: if flow_init fails, we > > need security_tun_dev_free_security, don't we? > > I think we need: > > +err_free_sec: security_tun_dev_free_security(tun->security); > > and goto here on flow_init failures. > > tun_flow_init() always succeed. So we're ok here. True. So please make it return void then. > > > > > err_free_dev: > > > > Pls shift this one 1 space left for consistency. > > > > Ok. > > > free_netdev(dev); > > > return err; > > > -- > > > 1.7.1 > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > > the body of a message to majord...@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > Please read the FAQ at http://www.tux.org/lkml/ > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
