[media] mxl111sf: Fix unintentional garbage stack read
authorDave Jones <davej@fedoraproject.org>
Thu, 30 Jan 2014 03:11:33 +0000 (00:11 -0300)
committerMauro Carvalho Chehab <m.chehab@samsung.com>
Tue, 4 Feb 2014 08:36:42 +0000 (06:36 -0200)
commit866e8d8a9dc1ebb4f9e67197e264ac2df81f7d4b
tree3a1d2e5ca3b140bcad30ae03401f6ef2f06036b2
parenta33dd5171d141c378df498aba3fa3c9a573cacb6
[media] mxl111sf: Fix unintentional garbage stack read

mxl111sf_read_reg takes an address of a variable to write to as an argument.
drivers/media/usb/dvb-usb-v2/mxl111sf-gpio.c:mxl111sf_config_pin_mux_modes
passes several uninitialized stack variables to this routine, expecting
them to be filled in.  In the event that something unexpected happens when
reading from the chip, we end up doing a pr_debug of the value passed in,
revealing whatever garbage happened to be on the stack.

Change the pr_debug to match what happens in the 'success' case, where we
assign buf[1] to *data.

Spotted with Coverity (Bugs 731910 through 731917)

Signed-off-by: Dave Jones <davej@fedoraproject.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Cc: stable@vger.kernel.org
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
drivers/media/usb/dvb-usb-v2/mxl111sf.c