[media] dvb_demux: fix deadlock in dmx_section_feed_release_filter()
dmx_section_feed_release_filter() locks dvbdmx->mutex and if the feed is still filtering, it calls feed->stop_filtering(feed). stop_filtering() is implemented by dmx_section_feed_stop_filtering() that first of all try to lock the same mutex: dvbdmx->mutex. That leads to a deadlock. It does not happen often in practice because all callers of release_filter() stop filtering by themselves. So the problem can happen in case of race condition only. The patch releases dvbdmx->mutex before call to feed->stop_filtering(feed) and reacquires the mutex after that. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by:Alexey Khoroshilov <khoroshilov@ispras.ru> Signed-off-by:
Michael Krufky <mkrufky@linuxtv.org> Signed-off-by:
Mauro Carvalho Chehab <m.chehab@samsung.com>
parent
858559a2
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