Patch "media: dm1105: Fix use after free bug in dm1105_remove due to race condition" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    media: dm1105: Fix use after free bug in dm1105_remove due to race condition

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     media-dm1105-fix-use-after-free-bug-in-dm1105_remove.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 233cf57994efd14b6f3bbe81b73c8943096a4708
Author: Zheng Wang <zyytlz.wz@xxxxxxx>
Date:   Sat Mar 18 16:15:06 2023 +0800

    media: dm1105: Fix use after free bug in dm1105_remove due to race condition
    
    [ Upstream commit 5abda7a16698d4d1f47af1168d8fa2c640116b4a ]
    
    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@xxxxxxx>
    Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/media/pci/dm1105/dm1105.c b/drivers/media/pci/dm1105/dm1105.c
index 4ac645a56c14e..9e9c7c071accc 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);



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