mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 11:29:53 +07:00
ad608fbcf1
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:
|
||
|---|---|---|
| .. | ||
| davinci | ||
| drv-intf | ||
| i2c | ||
| tpg | ||
| cec-notifier.h | ||
| cec-pin.h | ||
| cec.h | ||
| demux.h | ||
| dmxdev.h | ||
| dvb_ca_en50221.h | ||
| dvb_demux.h | ||
| dvb_frontend.h | ||
| dvb_math.h | ||
| dvb_net.h | ||
| dvb_ringbuffer.h | ||
| dvb_vb2.h | ||
| dvb-usb-ids.h | ||
| dvbdev.h | ||
| imx.h | ||
| media-device.h | ||
| media-devnode.h | ||
| media-entity.h | ||
| rc-core.h | ||
| rc-map.h | ||
| rcar-fcp.h | ||
| soc_camera.h | ||
| tuner-types.h | ||
| tuner.h | ||
| tveeprom.h | ||
| v4l2-async.h | ||
| v4l2-clk.h | ||
| v4l2-common.h | ||
| v4l2-ctrls.h | ||
| v4l2-dev.h | ||
| v4l2-device.h | ||
| v4l2-dv-timings.h | ||
| v4l2-event.h | ||
| v4l2-fh.h | ||
| v4l2-flash-led-class.h | ||
| v4l2-fwnode.h | ||
| v4l2-image-sizes.h | ||
| v4l2-ioctl.h | ||
| v4l2-mc.h | ||
| v4l2-mediabus.h | ||
| v4l2-mem2mem.h | ||
| v4l2-rect.h | ||
| v4l2-subdev.h | ||
| videobuf2-core.h | ||
| videobuf2-dma-contig.h | ||
| videobuf2-dma-sg.h | ||
| videobuf2-dvb.h | ||
| videobuf2-memops.h | ||
| videobuf2-v4l2.h | ||
| videobuf2-vmalloc.h | ||
| videobuf-core.h | ||
| videobuf-dma-contig.h | ||
| videobuf-dma-sg.h | ||
| videobuf-vmalloc.h | ||
| vsp1.h | ||