| Message ID | 20250224085604.417327-1-prashanth.k@oss.qualcomm.com |
|---|---|
| State | New |
| Headers | show |
| Series | usb: gadget: Check bmAttributes only if configuration is valid | expand |
On Mon, Feb 24, 2025 at 02:26:04PM +0530, Prashanth K wrote: > If the USB configuration is not valid, then avoid checking for > bmAttributes to prevent null pointer deference. > > Cc: stable@vger.kernel.org > Fixes: 40e89ff5750f ("usb: gadget: Set self-powered based on MaxPower and bmAttributes") > Signed-off-by: Prashanth K <prashanth.k@oss.qualcomm.com> > --- > drivers/usb/gadget/composite.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c > index 4bcf73bae761..869ad99afb48 100644 > --- a/drivers/usb/gadget/composite.c > +++ b/drivers/usb/gadget/composite.c > @@ -1051,7 +1051,7 @@ static int set_config(struct usb_composite_dev *cdev, > usb_gadget_set_remote_wakeup(gadget, 0); > done: > if (power > USB_SELF_POWER_VBUS_MAX_DRAW || > - !(c->bmAttributes & USB_CONFIG_ATT_SELFPOWER)) > + (c && !(c->bmAttributes & USB_CONFIG_ATT_SELFPOWER))) > usb_gadget_clear_selfpowered(gadget); > else > usb_gadget_set_selfpowered(gadget); > -- > 2.25.1 > > Have you checked linux-next yet for this fix that was posted last week? Does that not resolve the issue for you? thanks, greg k-h
On Mon, Feb 24, 2025 at 02:53:59PM +0530, Prashanth K wrote: > > > On 24-02-25 02:36 pm, Greg Kroah-Hartman wrote: > > On Mon, Feb 24, 2025 at 02:26:04PM +0530, Prashanth K wrote: > >> If the USB configuration is not valid, then avoid checking for > >> bmAttributes to prevent null pointer deference. > >> > >> Cc: stable@vger.kernel.org > >> Fixes: 40e89ff5750f ("usb: gadget: Set self-powered based on MaxPower and bmAttributes") > >> Signed-off-by: Prashanth K <prashanth.k@oss.qualcomm.com> > >> --- > >> drivers/usb/gadget/composite.c | 2 +- > >> 1 file changed, 1 insertion(+), 1 deletion(-) > >> > >> diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c > >> index 4bcf73bae761..869ad99afb48 100644 > >> --- a/drivers/usb/gadget/composite.c > >> +++ b/drivers/usb/gadget/composite.c > >> @@ -1051,7 +1051,7 @@ static int set_config(struct usb_composite_dev *cdev, > >> usb_gadget_set_remote_wakeup(gadget, 0); > >> done: > >> if (power > USB_SELF_POWER_VBUS_MAX_DRAW || > >> - !(c->bmAttributes & USB_CONFIG_ATT_SELFPOWER)) > >> + (c && !(c->bmAttributes & USB_CONFIG_ATT_SELFPOWER))) > >> usb_gadget_clear_selfpowered(gadget); > >> else > >> usb_gadget_set_selfpowered(gadget); > >> -- > >> 2.25.1 > >> > >> > > > > Have you checked linux-next yet for this fix that was posted last week? > > Does that not resolve the issue for you? > > > > thanks, > > > > greg k-h > > I hope you are mentioning this one - > https://lore.kernel.org/all/20250220120314.3614330-1-m.szyprowski@samsung.com/ Yes. > The above patch fixes null pointer in composite_suspend(), I'm trying to > address a similar bug which is present in set_config(), it gets exposed > if the requested configuration is not present in cdev->configs. Ah, missed that, sorry. I'll go queue this up too. thanks, greg k-h
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 4bcf73bae761..869ad99afb48 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -1051,7 +1051,7 @@ static int set_config(struct usb_composite_dev *cdev, usb_gadget_set_remote_wakeup(gadget, 0); done: if (power > USB_SELF_POWER_VBUS_MAX_DRAW || - !(c->bmAttributes & USB_CONFIG_ATT_SELFPOWER)) + (c && !(c->bmAttributes & USB_CONFIG_ATT_SELFPOWER))) usb_gadget_clear_selfpowered(gadget); else usb_gadget_set_selfpowered(gadget);
If the USB configuration is not valid, then avoid checking for bmAttributes to prevent null pointer deference. Cc: stable@vger.kernel.org Fixes: 40e89ff5750f ("usb: gadget: Set self-powered based on MaxPower and bmAttributes") Signed-off-by: Prashanth K <prashanth.k@oss.qualcomm.com> --- drivers/usb/gadget/composite.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)