Francesco Lavra wrote:
> 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);
>
Good catch, but it seems better to initialize both the mutex and the list head
at dvb_dmx_dev_init. Please test if the following patch fixes the issue. If so,
please
sign.
Cheers,
Mauro
diff --git a/drivers/media/dvb/dvb-core/dmxdev.c
b/drivers/media/dvb/dvb-core/dmxdev.c
index c37790a..be9bef1 100644
--- a/drivers/media/dvb/dvb-core/dmxdev.c
+++ b/drivers/media/dvb/dvb-core/dmxdev.c
@@ -755,13 +755,11 @@ static int dvb_demux_open(struct inode *inode, struct
file *file)
}
dmxdevfilter = &dmxdev->filter[i];
- mutex_init(&dmxdevfilter->mutex);
file->private_data = dmxdevfilter;
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++;
@@ -1239,6 +1237,8 @@ int dvb_dmxdev_init(struct dmxdev *dmxdev, struct
dvb_adapter *dvb_adapter)
dmxdev->filter[i].buffer.data = NULL;
dvb_dmxdev_filter_state_set(&dmxdev->filter[i],
DMXDEV_STATE_FREE);
+ mutex_init(&dmxdev->filter[i].mutex);
+ INIT_LIST_HEAD(&dmxdev->filter[i].feed.ts);
}
dvb_register_device(dvb_adapter, &dmxdev->dvbdev, &dvbdev_demux, dmxdev,
Cheers,
Mauro
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