On 22/05/06 03:02PM, Pavel Skripkin wrote:
> Hi Wang,
>
> On 5/6/22 14:33, Wang Cheng wrote:
> > On 22/05/06 10:41AM, Pavel Skripkin wrote:
> > > Hi Wang,
> > >
> > > On 5/6/22 06:16, Wang Cheng wrote:
> > >
> > > [snip]
> > >
> > > > > Reported-and-tested-by:
> > > syzbot+6f5ecd144854c0d8580b@xxxxxxxxxxxxxxxxxxxxxxxxx
> > > > Signed-off-by: Wang Cheng <wanngchenng@xxxxxxxxx>
> > > > ---
> > > > drivers/staging/rtl8712/usb_intf.c | 6 +++---
> > > > 1 file changed, 3 insertions(+), 3 deletions(-)
> > > > > diff --git a/drivers/staging/rtl8712/usb_intf.c
> > > b/drivers/staging/rtl8712/usb_intf.c
> > > > index ee4c61f85a07..50dcd3ecb685 100644
> > > > --- a/drivers/staging/rtl8712/usb_intf.c
> > > > +++ b/drivers/staging/rtl8712/usb_intf.c
> > > > @@ -538,13 +538,13 @@ static int r871xu_drv_init(struct usb_interface *pusb_intf,
> > > > } else {
> > > > AutoloadFail = false;
> > > > }
> > > > - if (((mac[0] == 0xff) && (mac[1] == 0xff) &&
> > > > + if ((!AutoloadFail) ||
> > > > + ((mac[0] == 0xff) && (mac[1] == 0xff) &&
> > > > (mac[2] == 0xff) && (mac[3] == 0xff) &&
> > > > (mac[4] == 0xff) && (mac[5] == 0xff)) ||
> > > > ((mac[0] == 0x00) && (mac[1] == 0x00) &&
> > > > (mac[2] == 0x00) && (mac[3] == 0x00) &&
> > > > - (mac[4] == 0x00) && (mac[5] == 0x00)) ||
> > > > - (!AutoloadFail)) {
> > > > + (mac[4] == 0x00) && (mac[5] == 0x00))) {
> > >
> > >
> > > That looks ugly. I mean mac checks. Can we, please, use sane kernel API like
> > > is_valid_ether_addr()?
> >
> > Good idea! But will is_valid_ether_addr() check a larger range?
> > The comment of is_valid_ether_addr()(include/linux/etherdevice.h) says:
> > Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
> > a *multicast address*, and is not FF:FF:FF:FF:FF:FF.
> >
>
> I am not good an expert at networking stuff, but can multicast mac address
> be valid for purpose of Wi-Fi adapter? IIUC it's can't, but as I said
> before, I am not an expert
Me neither. :P I found some reference here:
https://en.wikipedia.org/wiki/Multicast_address#Ethernet
And in the implementation of
is_multicast_ether_addr()(include/linux/etherdevice.h), it checks one
bit of mac address to determine a multicast or not.
Probably some other kernel API could help.
thanks,
- w
