From: Qinglang Miao <miaoqingl...@huawei.com>
[ Upstream commit 14d4c4fa46eeaa3922e8e1c4aa727eb0a1412804 ]
Use of sch->dev reference after the put_device() call could trigger
the use-after-free bugs.
Fix this by simply adjusting the position of put_device.
Fixes: 37db8985b211 ("s390/cio: add basic protected virtualization support")
Reported-by: Hulk Robot <hul...@huawei.com>
Suggested-by: Cornelia Huck <coh...@redhat.com>
Signed-off-by: Qinglang Miao <miaoqingl...@huawei.com>
Reviewed-by: Cornelia Huck <coh...@redhat.com>
Reviewed-by: Vineeth Vijayan <vnee...@linux.ibm.com>
[vnee...@linux.ibm.com: Slight modification in the commit-message]
Signed-off-by: Vineeth Vijayan <vnee...@linux.ibm.com>
Signed-off-by: Heiko Carstens <h...@linux.ibm.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
drivers/s390/cio/device.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 983f9c9e08deb..23e9227e60fd7 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1664,10 +1664,10 @@ void __init ccw_device_destroy_console(struct
ccw_device *cdev)
struct io_subchannel_private *io_priv = to_io_private(sch);
set_io_private(sch, NULL);
- put_device(&sch->dev);
- put_device(&cdev->dev);
dma_free_coherent(&sch->dev, sizeof(*io_priv->dma_area),
io_priv->dma_area, io_priv->dma_area_dma);
+ put_device(&sch->dev);
+ put_device(&cdev->dev);
kfree(io_priv);
}
--
2.27.0
