linux-kernel - [PATCH 3.10 33/89] [media] af9013: Dont accept invalid bandwidth

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Message-Id: <20150731194031.728867170@linuxfoundation.org>
Date:	Fri, 31 Jul 2015 12:41:15 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@....samsung.com>
Subject: [PATCH 3.10 33/89] [media] af9013: Dont accept invalid bandwidth

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mauro Carvalho Chehab <mchehab@....samsung.com>

commit d7b76c91f471413de9ded837bddeca2164786571 upstream.

If userspace sends an invalid bandwidth, it should either return
EINVAL or switch to auto mode.

This driver will go past an array and program the hardware on a
wrong way if this happens.

Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/dvb-frontends/af9013.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/media/dvb-frontends/af9013.c
+++ b/drivers/media/dvb-frontends/af9013.c
@@ -606,6 +606,10 @@ static int af9013_set_frontend(struct dv
 			}
 		}
 
+		/* Return an error if can't find bandwidth or the right clock */
+		if (i == ARRAY_SIZE(coeff_lut))
+			return -EINVAL;
+
 		ret = af9013_wr_regs(state, 0xae00, coeff_lut[i].val,
 			sizeof(coeff_lut[i].val));
 	}


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