On Tue, 31 Aug 2021 17:30:19 +0200 Oleksij Rempel wrote:
> Am 31.08.21 um 16:20 schrieb Andrew Lunn:
> > On Tue, Aug 31, 2021 at 06:48:45AM -0700, Jakub Kicinski wrote:
> >> On Tue, 31 Aug 2021 03:36:23 -0700 syzbot wrote:
> [...]
> >
> > Looking at the console messages:
> >
> > [ 36.456221][ T32] usb 1-1: new high-speed USB device number 2 using dummy_hcd
> > [ 36.976035][ T32] usb 1-1: New USB device found, idVendor=0df6, idProduct=0056, bcdDevice=42.6c
> > [ 36.985338][ T32] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> > [ 36.993579][ T32] usb 1-1: Product: syz
> > [ 36.997817][ T32] usb 1-1: Manufacturer: syz
> > [ 37.002423][ T32] usb 1-1: SerialNumber: syz
> > [ 37.013578][ T32] usb 1-1: config 0 descriptor??
> > [ 37.276018][ T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): invalid hw address, using random
> > executing program
> > [ 37.715517][ T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71
> > [ 37.725693][ T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to send software reset: ffffffb9
> > [ 37.925418][ T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71
> > [ 37.936461][ T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to send software reset: ffffffb9
> > [ 38.119561][ T32] asix 1-1:0.0 eth1: register 'asix' at usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet, 8a:c0:d1:1e:27:4c
> > [ 38.138828][ T32] usb 1-1: USB disconnect, device number 2
> > [ 38.150689][ T32] asix 1-1:0.0 eth1: unregister 'asix' usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet
> >
> > So this is a AX88178, and you would expect it to use
> > ax88178_bind(). That function never calls ax88772_init_phy() which is
> > what connects the PHY to the MAC, and sets priv->phydev.
> >
> > static void ax88772_unbind(struct usbnet *dev, struct usb_interface *intf)
> > {
> > struct asix_common_private *priv = dev->driver_priv;
> >
> > phy_disconnect(priv->phydev);
> >
> > So this passes a NULL pointer.
> >
> > static const struct driver_info ax88178_info = {
> > .description = "ASIX AX88178 USB 2.0 Ethernet",
> > .bind = ax88178_bind,
> > .unbind = ax88772_unbind,
> > .status = asix_status,
> >
> > You cannot pair ax88178_bind with ax88772_unbind. Either a
> > ax88178_unbind is needed, or ax88772_unbind needs to check for a NULL
> > pointer.
> >
> > Andrew
> >
>
> Yes, this was fixed following patch:
> https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/drivers/net/usb/asix_devices.c?id=1406e8cb4b05fdc67692b1af2da39d7ca5278713
#syz fix: net: usb: asix: do not call phy_disconnect() for ax88178
