[Bug 205174] multimedia/webcamd: Segfault with RTL2832U/R820T-based DVB-T USB stick

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205174

            Bug ID: 205174
           Summary: multimedia/webcamd: Segfault with RTL2832U/R820T-based
                    DVB-T USB stick
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: hselasky at FreeBSD.org
          Reporter: f.degner at gmx.de
          Assignee: hselasky at FreeBSD.org
             Flags: maintainer-feedback?(hselasky at FreeBSD.org)

Created attachment 164029
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=164029&action=edit
Added NULL check

Webcamd segfaults when used with the following dvb-t usb stick:

# usbconfig -u 1 -a 5 dump_device_desc
ugen1.5: <RTL2832U Generic> ...
  ...
  idVendor = 0x0bda 
  idProduct = 0x2832 
  ...
#

Here is what gdb reports:

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00000000007492df in rtl2832u_tuner_attach (adap=0x8024ab050)
    at media_tree/drivers/media/usb/dvb-usb-v2/rtl28xxu.c:1324
1324                    if (IS_ERR(pdev) || pdev->dev.driver == NULL)
...
(gdb) p pdev
$1 = (struct platform_device *) 0x0
(gdb)


Applying the attached patch to rtl28xxu.c fixed the problem.

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