William Wu aabebc2bdf usb: gadget: uvc: fix possible NULL pointer dereference
This patch fixes the following panic when close the uvc
application in usb host.

Unable to handle kernel NULL pointer dereference at virtual address 00000003
pgd = 21faf91f
[00000003] *pgd=151af835, *pte=00000000, *ppte=00000000
Internal error: Oops: 17 [#1] PREEMPT SMP ARM
Modules linked in: galcore(O)
CPU: 1 PID: 720 Comm: uvc_gadget_pthr Tainted: G        W  O      4.19.111 #8
Hardware name: Generic DT based system
PC is at uvcg_video_ep_queue+0x40/0x58
LR is at uvcg_video_ep_queue+0x38/0x58
...
[<b04fff54>] (uvcg_video_ep_queue) from [<b05003a4>] (uvcg_video_pump+0x7c/0x104)
[<b05003a4>] (uvcg_video_pump) from [<b0527cd8>] (__video_do_ioctl+0x1c8/0x3a0)
[<b0527cd8>] (__video_do_ioctl) from [<b052b40c>] (video_usercopy+0x200/0x494)
[<b052b40c>] (video_usercopy) from [<b022043c>] (do_vfs_ioctl+0xac/0x798)
[<b022043c>] (do_vfs_ioctl) from [<b0220b5c>] (ksys_ioctl+0x34/0x58)
[<b0220b5c>] (ksys_ioctl) from [<b0101000>] (ret_fast_syscall+0x0/0x4c)

Change-Id: I893e4c2b95f9b583423e68d68e7beff1cd114687
Signed-off-by: William Wu <william.wu@rock-chips.com>
2020-04-21 11:08:23 +08:00
2019-02-10 00:33:21 +08:00
2020-03-03 07:33:01 +01:00
2019-02-10 00:33:21 +08:00
2019-02-10 00:33:21 +08:00
2019-08-29 19:45:37 +08:00
2019-08-29 19:45:37 +08:00
2020-03-03 07:33:01 +01:00

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.
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