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[media] dmxdev: don't use before checking file->private_data 

As reported by smatch:
	drivers/media/dvb-core/dmxdev.c:1091 dvb_demux_poll() warn: variable dereferenced before check 'dmxdevfilter' (see line 1088)

This was introduced by changeset d102cac809.

We need to test before using it.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2014-09-03 14:32:26 -03:00
parent fe10b84e7f
commit 313ddec45c
1 changed files with 1 additions and 2 deletions
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3
drivers/media/dvb-core/dmxdev.c
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@ -1085,10 +1085,9 @@ static long dvb_demux_ioctl(struct file *file, unsigned int cmd,
static unsigned int dvb_demux_poll(struct file *file, poll_table *wait)
{
struct dmxdev_filter *dmxdevfilter = file->private_data;
struct dmxdev *dmxdev = dmxdevfilter->dev;
unsigned int mask = 0;
if ((!dmxdevfilter) || (dmxdev->exit))
if ((!dmxdevfilter) || dmxdevfilter->dev->exit)
return POLLERR;
poll_wait(file, &dmxdevfilter->buffer.queue, wait);