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Message-ID: <20231102090630.938759-1-renmingshuai@huawei.com> Date: Thu, 2 Nov 2023 17:06:30 +0800 From: Ren Mingshuai <renmingshuai@...wei.com> To: <kuba@...nel.org> CC: <caowangbao@...wei.com>, <davem@...emloft.net>, <khlebnikov@...nvz.org>, <liaichun@...wei.com>, <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>, <oneukum@...e.com>, <renmingshuai@...wei.com>, <yanan@...wei.com> Subject: Re: [PATCH] net: usbnet: Fix potential NULL pointer dereference >> >23ba07991dad said SKB can be NULL without describing the triggering >> >scenario. Always Check it before dereference to void potential NULL >> >pointer dereference. >> I've tried to find out the scenarios where SKB is NULL, but failed. >> It seems impossible for SKB to be NULL. If SKB can be NULL, please >> tell me the reason and I'd be very grateful. > >What do you mean? Grepping the function name shows call sites with NULL getting passed as skb. Yes And I just learned that during the cdc_ncm_driver.probe, it is possible to pass a NULL SKB to usbnet_start_xmit().
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