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[media] saa7164: Check if dev is NULL before dereferencing it

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As reported by smatch:
	drivers/media/pci/saa7164/saa7164-core.c:631 saa7164_irq() warn: variable dereferenced before check 'dev' (see line 621)

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2015-04-28 10:07:01 -03:00
parent 5a4faee2d0
commit 3c71d978c5
1 changed files with 8 additions and 6 deletions
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14
drivers/media/pci/saa7164/saa7164-core.c
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@ -618,12 +618,7 @@ static irqreturn_t saa7164_irq_ts(struct saa7164_port *port)
static irqreturn_t saa7164_irq(int irq, void *dev_id)
{
struct saa7164_dev *dev = dev_id;
struct saa7164_port *porta = &dev->ports[SAA7164_PORT_TS1];
struct saa7164_port *portb = &dev->ports[SAA7164_PORT_TS2];
struct saa7164_port *portc = &dev->ports[SAA7164_PORT_ENC1];
struct saa7164_port *portd = &dev->ports[SAA7164_PORT_ENC2];
struct saa7164_port *porte = &dev->ports[SAA7164_PORT_VBI1];
struct saa7164_port *portf = &dev->ports[SAA7164_PORT_VBI2];
struct saa7164_port *porta, *portb, *portc, *portd, *porte, *portf;
u32 intid, intstat[INT_SIZE/4];
int i, handled = 0, bit;
@ -634,6 +629,13 @@ static irqreturn_t saa7164_irq(int irq, void *dev_id)
goto out;
}
porta = &dev->ports[SAA7164_PORT_TS1];
portb = &dev->ports[SAA7164_PORT_TS2];
portc = &dev->ports[SAA7164_PORT_ENC1];
portd = &dev->ports[SAA7164_PORT_ENC2];
porte = &dev->ports[SAA7164_PORT_VBI1];
portf = &dev->ports[SAA7164_PORT_VBI2];
/* Check that the hardware is accessible. If the status bytes are
* 0xFF then the device is not accessible, the the IRQ belongs
* to another driver.