This is a note to let you know that I've just added the patch titled
media: dvbdev: drop refcount on error path in dvb_device_open()
to the 4.19-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-dvbdev-drop-refcount-on-error-path-in-dvb_devi.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2dc939880cb1cb00b784b1565f17feb4172a41b8
Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Tue Oct 31 12:53:33 2023 +0300
media: dvbdev: drop refcount on error path in dvb_device_open()
[ Upstream commit a2dd235df435a05d389240be748909ada91201d2 ]
If call to file->f_op->open() fails, then call dvb_device_put(dvbdev).
Fixes: 0fc044b2b5e2 ("media: dvbdev: adopts refcnt to avoid UAF")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/media/dvb-core/dvbdev.c b/drivers/media/dvb-core/dvbdev.c
index e103999711fc..b8335ede6626 100644
--- a/drivers/media/dvb-core/dvbdev.c
+++ b/drivers/media/dvb-core/dvbdev.c
@@ -113,6 +113,8 @@ static int dvb_device_open(struct inode *inode, struct file *file)
err = file->f_op->open(inode, file);
up_read(&minor_rwsem);
mutex_unlock(&dvbdev_mutex);
+ if (err)
+ dvb_device_put(dvbdev);
return err;
}
fail:
