[PATCH 1/3] media: adv7604: avoid negative array index in log_status when cp_read fails

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

cp_read() returns the negative errno from regmap_read() on I2C failure.
adv76xx_log_status() shifts the result right by 4 and uses it directly
to index csc_coeff_sel_rb[16] causing the right shift of a negative
number to result in -1, reading a negative place in the array.

Commit 8163419e3e05 ("media: adv7842: Avoid possible out-of-bounds
array accesses in adv7842_cp_log_status()") fixed the identical pattern
in the adv7842, so do the same thing here.

Cc: Hans Verkuil <hverkuil@kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Fixes: 54450f591c99 ("[media] adv7604: driver for the Analog Devices ADV7604 video decoder")
Cc: stable <stable@kernel.org>
Assisted-by: gregkh_clanker_t1000
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/media/i2c/adv7604.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c
index 67116a4ef134..02203fd4c937 100644
--- a/drivers/media/i2c/adv7604.c
+++ b/drivers/media/i2c/adv7604.c
@@ -2641,8 +2641,9 @@ static int adv76xx_log_status(struct v4l2_subdev *sd)
 					"(16-235)" : "(0-255)",
 				(reg_io_0x02 & 0x08) ? "enabled" : "disabled");
 	}
+	ret = cp_read(sd, info->cp_csc) >> 4;
 	v4l2_info(sd, "Color space conversion: %s\n",
-			csc_coeff_sel_rb[cp_read(sd, info->cp_csc) >> 4]);
+			ret < 0 ? "" : csc_coeff_sel_rb[ret]);
 
 	if (!is_digital_input(sd))
 		return 0;
-- 
2.53.0