| Message ID | 20220803162422.2981308-1-nathan@kernel.org |
|---|---|
| State | New |
| Headers | show |
| Series | usb: cdns3: Don't use priv_dev uninitialized in cdns3_gadget_ep_enable() | expand |
On 22-08-03 09:24:22, Nathan Chancellor wrote: > Clang warns: > > drivers/usb/cdns3/cdns3-gadget.c:2290:11: error: variable 'priv_dev' is uninitialized when used here [-Werror,-Wuninitialized] > dev_dbg(priv_dev->dev, "usbss: invalid parameters\n"); > ^~~~~~~~ > include/linux/dev_printk.h:155:18: note: expanded from macro 'dev_dbg' > dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__) > ^~~ > include/linux/dynamic_debug.h:167:7: note: expanded from macro 'dynamic_dev_dbg' > dev, fmt, ##__VA_ARGS__) > ^~~ > include/linux/dynamic_debug.h:152:56: note: expanded from macro '_dynamic_func_call' > __dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__) > ^~~~~~~~~~~ > include/linux/dynamic_debug.h:134:15: note: expanded from macro '__dynamic_func_call' > func(&id, ##__VA_ARGS__); \ > ^~~~~~~~~~~ > drivers/usb/cdns3/cdns3-gadget.c:2278:31: note: initialize the variable 'priv_dev' to silence this warning > struct cdns3_device *priv_dev; > ^ > = NULL > 1 error generated. > > The priv_dev assignment was moved below the if statement to avoid > potentially dereferencing ep before it was checked but priv_dev is used > in the dev_dbg() call. > > To fix this, move the priv_dev and comp_desc assignments back to their > original spot and hoist the ep check above those assignments with a call > to pr_debug() instead of dev_dbg(). > > Fixes: c3ffc9c4ca44 ("usb: cdns3: change place of 'priv_ep' assignment in cdns3_gadget_ep_dequeue(), cdns3_gadget_ep_enable()") > Link: https://github.com/ClangBuiltLinux/linux/issues/1680 > Signed-off-by: Nathan Chancellor <nathan@kernel.org> Acked-by: Peter Chen <peter.chen@kernel.org> > --- > drivers/usb/cdns3/cdns3-gadget.c | 12 ++++++++---- > 1 file changed, 8 insertions(+), 4 deletions(-) > > diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c > index 9ac7d0a8c5da..d21b69997e75 100644 > --- a/drivers/usb/cdns3/cdns3-gadget.c > +++ b/drivers/usb/cdns3/cdns3-gadget.c > @@ -2284,16 +2284,20 @@ static int cdns3_gadget_ep_enable(struct usb_ep *ep, > int ret = 0; > int val; > > + if (!ep) { > + pr_debug("usbss: ep not configured?\n"); > + return -EINVAL; > + } > + > priv_ep = ep_to_cdns3_ep(ep); > + priv_dev = priv_ep->cdns3_dev; > + comp_desc = priv_ep->endpoint.comp_desc; > > - if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) { > + if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) { > dev_dbg(priv_dev->dev, "usbss: invalid parameters\n"); > return -EINVAL; > } > > - comp_desc = priv_ep->endpoint.comp_desc; > - priv_dev = priv_ep->cdns3_dev; > - > if (!desc->wMaxPacketSize) { > dev_err(priv_dev->dev, "usbss: missing wMaxPacketSize\n"); > return -EINVAL; > > base-commit: 8288c99fc263bcafc5df5fa8c278b2eb8106364e > -- > 2.37.1 >
diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c index 9ac7d0a8c5da..d21b69997e75 100644 --- a/drivers/usb/cdns3/cdns3-gadget.c +++ b/drivers/usb/cdns3/cdns3-gadget.c @@ -2284,16 +2284,20 @@ static int cdns3_gadget_ep_enable(struct usb_ep *ep, int ret = 0; int val; + if (!ep) { + pr_debug("usbss: ep not configured?\n"); + return -EINVAL; + } + priv_ep = ep_to_cdns3_ep(ep); + priv_dev = priv_ep->cdns3_dev; + comp_desc = priv_ep->endpoint.comp_desc; - if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) { + if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) { dev_dbg(priv_dev->dev, "usbss: invalid parameters\n"); return -EINVAL; } - comp_desc = priv_ep->endpoint.comp_desc; - priv_dev = priv_ep->cdns3_dev; - if (!desc->wMaxPacketSize) { dev_err(priv_dev->dev, "usbss: missing wMaxPacketSize\n"); return -EINVAL;
Clang warns: drivers/usb/cdns3/cdns3-gadget.c:2290:11: error: variable 'priv_dev' is uninitialized when used here [-Werror,-Wuninitialized] dev_dbg(priv_dev->dev, "usbss: invalid parameters\n"); ^~~~~~~~ include/linux/dev_printk.h:155:18: note: expanded from macro 'dev_dbg' dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__) ^~~ include/linux/dynamic_debug.h:167:7: note: expanded from macro 'dynamic_dev_dbg' dev, fmt, ##__VA_ARGS__) ^~~ include/linux/dynamic_debug.h:152:56: note: expanded from macro '_dynamic_func_call' __dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__) ^~~~~~~~~~~ include/linux/dynamic_debug.h:134:15: note: expanded from macro '__dynamic_func_call' func(&id, ##__VA_ARGS__); \ ^~~~~~~~~~~ drivers/usb/cdns3/cdns3-gadget.c:2278:31: note: initialize the variable 'priv_dev' to silence this warning struct cdns3_device *priv_dev; ^ = NULL 1 error generated. The priv_dev assignment was moved below the if statement to avoid potentially dereferencing ep before it was checked but priv_dev is used in the dev_dbg() call. To fix this, move the priv_dev and comp_desc assignments back to their original spot and hoist the ep check above those assignments with a call to pr_debug() instead of dev_dbg(). Fixes: c3ffc9c4ca44 ("usb: cdns3: change place of 'priv_ep' assignment in cdns3_gadget_ep_dequeue(), cdns3_gadget_ep_enable()") Link: https://github.com/ClangBuiltLinux/linux/issues/1680 Signed-off-by: Nathan Chancellor <nathan@kernel.org> --- drivers/usb/cdns3/cdns3-gadget.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) base-commit: 8288c99fc263bcafc5df5fa8c278b2eb8106364e