| Message ID | 20230312140012.1816214-1-zyytlz.wz@163.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | media: dm1105: Fix use after free bug in dm1105_remove due to race condition | expand |
diff --git a/drivers/media/pci/dm1105/dm1105.c b/drivers/media/pci/dm1105/dm1105.c index 4ac645a56c14..9e9c7c071acc 100644 --- a/drivers/media/pci/dm1105/dm1105.c +++ b/drivers/media/pci/dm1105/dm1105.c @@ -1176,6 +1176,7 @@ static void dm1105_remove(struct pci_dev *pdev) struct dvb_demux *dvbdemux = &dev->demux; struct dmx_demux *dmx = &dvbdemux->dmx; + cancel_work_sync(&dev->ir.work); dm1105_ir_exit(dev); dmx->close(dmx); dvb_net_release(&dev->dvbnet);
In dm1105_probe, it called dm1105_ir_init and bound &dm1105->ir.work with dm1105_emit_key. When it handles IRQ request with dm1105_irq, it may call schedule_work to start the work. When we call dm1105_remove to remove the driver, there may be a sequence as follows: Fix it by finishing the work before cleanup in dm1105_remove CPU0 CPU1 |dm1105_emit_key dm1105_remove | dm1105_ir_exit | rc_unregister_device | rc_free_device | rc_dev_release | kfree(dev); | | | rc_keydown | //use Fixes: 34d2f9bf189c ("V4L/DVB: dm1105: use dm1105_dev & dev instead of dm1105dvb") Signed-off-by: Zheng Wang <zyytlz.wz@163.com> --- drivers/media/pci/dm1105/dm1105.c | 1 + 1 file changed, 1 insertion(+)