linux-kernel - [BUG] media: pci: cx18: a possible null-pointer dereference in cx18

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Message-ID: <d49c3c7d-1f2c-6eae-414e-b8e8bc813ebc@gmail.com>
Date:   Mon, 29 Jul 2019 17:40:48 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     awalls@...metrocast.net, mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [BUG] media: pci: cx18: a possible null-pointer dereference in
 cx18_vapi()

In cx18_vapi(), when cx is NULL, it is still used on line 833:
     CX18_ERR("cx == NULL (cmd=%x)\n", cmd);
          v4l2_err(&cx->v4l2_dev, fmt , ## args)

Thus, a possible null-pointer dereference may occur.

This bug is found by a static analysis tool STCheck written by us.

I do not know how to correctly fix this bug, so I only report it.


Best wishes,
Jia-Ju Bai