On Thu, Oct 30, 2014 at 07:30:16PM +0900, Yoshihiro Shimoda wrote: > From: Kazuya Mizuguchi <kazuya.mizuguchi.ks@xxxxxxxxxxx> > > This patch fixes an issue that the NULL pointer dereference happens > when we uses g_audio driver. Since the g_audio driver will call > usb_ep_disable() in afunc_set_alt() before it calls usb_ep_enable(), > the uep->pipe of renesas usbhs driver will be NULL. So, this patch > adds a condition to avoid the oops. > > Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@xxxxxxxxxxx> > Signed-off-by: Takeshi Kihara <takeshi.kihara.df@xxxxxxxxxxx> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> > Cc: <stable@xxxxxxxxxxxxxxx> > --- > drivers/usb/renesas_usbhs/mod_gadget.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c > index 2d17c10..2d0903f 100644 > --- a/drivers/usb/renesas_usbhs/mod_gadget.c > +++ b/drivers/usb/renesas_usbhs/mod_gadget.c > @@ -602,6 +602,9 @@ static int usbhsg_ep_disable(struct usb_ep *ep) > struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep); > struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); > > + if (!uep || !uep->pipe) how can uep ever be NULL ? Look at the definition of usbhsg_ep_to_uep(): #define usbhsg_ep_to_uep(e) container_of(e, struct usbhsg_uep, ep) how can a container_of() ever return NULL ? What you should check if "ep" (the argument to this function) being NULL. -- balbi
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