From 78acd4ca433425e6dd4032cfc2156c60e34931f2 Mon Sep 17 00:00:00 2001 From: Nathan Chancellor Date: Wed, 3 Aug 2022 09:24:22 -0700 Subject: [PATCH] usb: cdns3: Don't use priv_dev uninitialized in cdns3_gadget_ep_enable() 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 Signed-off-by: Linus Torvalds --- 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 9ac7d0a..d21b699 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; -- 2.7.4