From: Mauro Carvalho Chehab Date: Wed, 3 Sep 2014 17:32:26 +0000 (-0300) Subject: [media] dmxdev: don't use before checking file->private_data X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=313ddec45cf1a7b3778eaa9fd3acb31f994b2e88;p=linux-beck.git [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 d102cac8097c. We need to test before using it. Signed-off-by: Mauro Carvalho Chehab --- 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);