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linux/include/media
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Sakari Ailus ad608fbcf1 media: v4l: event: Prevent freeing event subscriptions while accessed 
The event subscriptions are added to the subscribed event list while
holding a spinlock, but that lock is subsequently released while still
accessing the subscription object. This makes it possible to unsubscribe
the event --- and freeing the subscription object's memory --- while
the subscription object is simultaneously accessed.

Prevent this by adding a mutex to serialise the event subscription and
unsubscription. This also gives a guarantee to the callback ops that the
add op has returned before the del op is called.

This change also results in making the elems field less special:
subscriptions are only added to the event list once they are fully
initialised.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: stable@vger.kernel.org # for 4.14 and up
Fixes: c3b5b0241f ("V4L/DVB: V4L: Events: Add backend")
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
2018-10-03 06:32:51 -04:00
..
davinci media: platform: davinci: drop VPFE_CMD_S_CCDC_RAW_PARAMS 2017-07-26 06:14:33 -04:00
drv-intf media: include: media: Add Renesas CEU driver interface 2018-02-26 08:59:41 -05:00
i2c media: i2c: lm3560: add support for lm3559 chip 2018-06-28 07:10:01 -04:00
tpg media: include/(uapi/)media: add SPDX license info 2018-02-14 13:23:51 -05:00
cec-notifier.h media: cec-notifier: Get notifier by device and connector name 2018-07-13 08:44:16 +01:00
cec-pin.h media: cec: add support for 5V signal testing 2018-07-25 07:11:48 -04:00
cec.h media: cec: add support for 5V signal testing 2018-07-25 07:11:48 -04:00
demux.h media: dvb: update buffer mmaped flags and frame counter 2018-02-23 11:44:08 -05:00
dmxdev.h media: dmxdev: Fix the logic that enables DMA mmap support 2018-02-23 05:27:10 -05:00
dvb_ca_en50221.h media: move dvb kAPI headers to include/media 2017-12-28 13:16:01 -05:00
dvb_demux.h media: dvb: update buffer mmaped flags and frame counter 2018-02-23 11:44:08 -05:00
dvb_frontend.h media: dvb: represent min/max/step/tolerance freqs in Hz 2018-08-02 18:10:48 -04:00
dvb_math.h media: move dvb kAPI headers to include/media 2017-12-28 13:16:01 -05:00
dvb_net.h media: move dvb kAPI headers to include/media 2017-12-28 13:16:01 -05:00
dvb_ringbuffer.h media: move dvb kAPI headers to include/media 2017-12-28 13:16:01 -05:00
dvb_vb2.h media: dvb: update buffer mmaped flags and frame counter 2018-02-23 11:44:08 -05:00
dvb-usb-ids.h media: dvb: add alternative USB PID for Hauppauge WinTV-soloHD 2018-05-04 14:20:55 -04:00
dvbdev.h media: dvbdev: add a mutex protecting the "mdev" pointer 2018-05-11 12:09:59 -04:00
imx.h [media] media: Add i.MX media core driver 2017-06-20 07:30:38 -03:00
media-device.h media: media-device: remove driver_version 2017-08-08 06:02:22 -04:00
media-devnode.h ->poll() methods should return __poll_t 2017-11-27 16:19:52 -05:00
media-entity.h media: entity: fix spelling for media_entity_get_fwnode_pad() 2018-05-09 15:49:41 -04:00
rc-core.h media: rc: default to idle on at startup or after reset 2018-05-14 07:14:51 -04:00
rc-map.h media: rc: add new imon protocol decoder and encoder 2018-03-21 11:12:29 -04:00
rcar-fcp.h v4l: rcar-fcp: Add an API to retrieve the FCP device 2017-06-09 12:25:36 +01:00
soc_camera.h ->poll() methods should return __poll_t 2017-11-27 16:19:52 -05:00
tuner-types.h media: tuner-types: add kernel-doc markups for struct tunertype 2017-12-18 09:06:40 -05:00
tuner.h [media] v4l2-mc.h: move tuner PAD definitions to this new header 2016-02-01 07:19:44 -02:00
tveeprom.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
v4l2-async.h media: fix usage of whitespaces and on indentation 2018-01-04 13:12:01 -05:00
v4l2-clk.h media: Convert to using %pOF instead of full_name 2017-08-20 08:20:20 -04:00
v4l2-common.h media: v4l-common: Make v4l2_find_nearest_size more sparse-friendly 2018-06-28 09:23:56 -04:00
v4l2-ctrls.h media: v4l2-ctrls.h: fix v4l2_ctrl field description typos 2018-07-25 08:36:05 -04:00
v4l2-dev.h media: v4l2-core: push taking ioctl mutex down to ioctl handler 2018-05-28 16:31:44 -04:00
v4l2-device.h media: v4l2-device.h: always expose mdev 2018-05-11 11:26:56 -04:00
v4l2-dv-timings.h media: v4l2-dv-timings: add v4l2_hdmi_colorimetry() 2018-02-22 12:41:09 -05:00
v4l2-event.h media: fix usage of whitespaces and on indentation 2018-01-04 13:12:01 -05:00
v4l2-fh.h media: v4l: event: Prevent freeing event subscriptions while accessed 2018-10-03 06:32:51 -04:00
v4l2-flash-led-class.h media: v4l2-flash-led-class.h: add kernel-doc to two helper funcs 2017-12-18 10:40:41 -05:00
v4l2-fwnode.h media: v4l: fwnode: Fix comment incorrectly mentioning v4l2_fwnode_parse_endpoint 2018-04-23 17:20:07 -04:00
v4l2-image-sizes.h [media] media: v4l2-image-sizes.h: correct the SVGA height definition 2014-12-04 13:56:56 -02:00
v4l2-ioctl.h media: v4l2-ioctl: create helper to fill in v4l2_standard for ENUMSTD 2018-06-28 07:29:24 -04:00
v4l2-mc.h [media] get rid of a number of problems at the cross references 2016-09-22 10:00:23 -03:00
v4l2-mediabus.h media: v4l2-fwnode: parse 'data-enable-active' prop 2018-07-24 14:57:38 -04:00
v4l2-mem2mem.h media: v4l2-mem2mem: add v4l2_m2m_last_buf() 2018-07-25 08:10:31 -04:00
v4l2-rect.h media: include/(uapi/)media: add SPDX license info 2018-02-14 13:23:51 -05:00
v4l2-subdev.h media: add tuner standby op, use where needed 2018-03-21 12:05:39 -04:00
videobuf2-core.h media: vb2-core: vb2_ops: document non-interrupt-context calling 2018-03-21 12:01:21 -04:00
videobuf2-dma-contig.h dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
videobuf2-dma-sg.h [media] vb2: replace void *alloc_ctxs by struct device *alloc_devs 2016-07-08 14:45:07 -03:00
videobuf2-dvb.h media: move dvb kAPI headers to include/media 2017-12-28 13:16:01 -05:00
videobuf2-memops.h media: vb2: add cross references at memops and v4l2 kernel-doc markups 2017-12-18 12:27:41 -05:00
videobuf2-v4l2.h media updates for v4.16-rc1 2018-02-06 11:27:48 -08:00
videobuf2-vmalloc.h [media] media: videobuf2: Replace videobuf2-core with videobuf2-v4l2 2015-10-01 08:48:18 -03:00
videobuf-core.h MAINTAINERS & files: Canonize the e-mails I use at files 2018-05-04 06:21:06 -04:00
videobuf-dma-contig.h [media] videobuf-dma-contig: remove support for cached mem 2013-04-25 09:50:19 -03:00
videobuf-dma-sg.h MAINTAINERS & files: Canonize the e-mails I use at files 2018-05-04 06:21:06 -04:00
videobuf-vmalloc.h MAINTAINERS & files: Canonize the e-mails I use at files 2018-05-04 06:21:06 -04:00
vsp1.h media: vsp1: Support Interlaced display pipelines 2018-08-03 16:02:27 -04:00