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[media] cx231xx-i2c: handle errors with cx231xx_get_i2c_adap()

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The cx231xx_get_i2c_adap() function should return the I2C
adapter that will be used to talk with a device. It should never
be NULL, as otherwise the driver will try to dereference a
null pointer.

We might instead fix the callers, but if this condition
ever happens, it is really a driver bug, because i2c_port
should always be a value from enum CX231XX_I2C_MASTER_PORT.

Found when checking the code due to this bug:

[   39.769021] BUG: unable to handle kernel NULL pointer dereference at 0000000000000002
[   39.769105] IP: [<ffffffff81638393>] i2c_master_send+0x13/0x70

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2016-09-05 05:41:53 -03:00
parent 7adc79980d
commit 4001dfb4b5
1 changed files with 1 additions and 1 deletions
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2
drivers/media/usb/cx231xx/cx231xx-i2c.c
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@ -608,7 +608,7 @@ struct i2c_adapter *cx231xx_get_i2c_adap(struct cx231xx *dev, int i2c_port)
case I2C_1_MUX_3:
return dev->muxc->adapter[1];
default:
return NULL;
BUG();
}
}
EXPORT_SYMBOL_GPL(cx231xx_get_i2c_adap);