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 d102cac8097c.
We need to test if dmxdevfilter exists before using it.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
diff --git a/drivers/media/dvb-core/dmxdev.c b/drivers/media/dvb-core/dmxdev.c
index 42b5e70d5ca7..abff803ad69a 100644
--- a/drivers/media/dvb-core/dmxdev.c
+++ b/drivers/media/dvb-core/dmxdev.c
@@ -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);
--
1.9.3
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