linux-kernel - Reply: A null-ptr crash in linux-6.4 usb driver

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Message-ID: <043105feee62401f833a06ea480a3b1b@qianxin.com>
Date:   Wed, 8 Nov 2023 07:40:08 +0000
From:   柳菁峰 <liujingfeng@...nxin.com>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     Marco Elver <elver@...gle.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "security@...nel.org" <security@...nel.org>,
        "syzkaller@...glegroups.com" <syzkaller@...glegroups.com>
Subject: Reply: A null-ptr crash in linux-6.4 usb driver

I have made a patch that simply checks for null pointer, but I am not sure if this will affect certain functions or logic. I hope you can check it carefully.

1006c1006
<       if (dev->p->dead) {
---
>       if (!dev->p||dev->p->dead) {



>Try it and see!  You have the reproducer, so you are in the best position to work on this.