A DVB demultiplexer device can be used to set up either a PES filter or
a section filter. In the former case, the ts field of the feed union of
struct dmxdev_filter is used, in the latter case the sec field of the
same union is used.
The ts field is a struct list_head, and is currently initialized in the
open() method of the demux device. When for a given demuxer a section
filter is set up, the sec field is played with, thus if a PES filter
needs to be set up after that the ts field will be corrupted, causing a
kernel oops.
This fix moves the list head initialization to
dvb_dmxdev_pes_filter_set(), so that the ts field is properly
initialized every time a PES filter is set up.
Signed-off-by: Francesco Lavra <francescola...@interfree.it>
Cc: stable <sta...@kernel.org>
---
--- a/drivers/media/dvb/dvb-core/dmxdev.c 2010-02-07 13:19:18.000000000
+0100
+++ b/drivers/media/dvb/dvb-core/dmxdev.c 2010-02-07 13:23:39.000000000
+0100
@@ -761,7 +761,6 @@ static int dvb_demux_open(struct inode *
dvb_ringbuffer_init(&dmxdevfilter->buffer, NULL, 8192);
dmxdevfilter->type = DMXDEV_TYPE_NONE;
dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
- INIT_LIST_HEAD(&dmxdevfilter->feed.ts);
init_timer(&dmxdevfilter->timer);
dvbdev->users++;
@@ -887,6 +886,7 @@ static int dvb_dmxdev_pes_filter_set(str
dmxdevfilter->type = DMXDEV_TYPE_PES;
memcpy(&dmxdevfilter->params, params,
sizeof(struct dmx_pes_filter_params));
+ INIT_LIST_HEAD(&dmxdevfilter->feed.ts);
dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
--
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