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Yang Yingliang 82e6843266 cxl: fix possible null-ptr-deref in cxl_pci_init_afu|adapter()

[ Upstream commit 02cd3032b1 ]

If device_register() fails in cxl_pci_afu|adapter(), the device
is not added, device_unregister() can not be called in the error
path, otherwise it will cause a null-ptr-deref because of removing
not added device.

As comment of device_register() says, it should use put_device() to give
up the reference in the error path. So split device_unregister() into
device_del() and put_device(), then goes to put dev when register fails.

Fixes: f204e0b8ce ("cxl: Driver code for powernv PCIe based cards for userspace access")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Acked-by: Frederic Barrat <fbarrat@linux.ibm.com>
Acked-by: Andrew Donnellan <ajd@linux.ibm.com>
Link: https://lore.kernel.org/r/20221111145440.2426970-2-yangyingliang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2023-01-07 12:07:25 +01:00

api.c

cxl: Fix driver use count

2017-10-05 09:44:04 +02:00

base.c

cxl: Add support for interrupts on the Mellanox CX4

2016-07-14 20:27:08 +10:00

context.c

cxl: Prevent adapter reset if an active context exists

2016-10-19 20:35:39 +11:00

cxl.h

cxl: fix nested locking hang during EEH hotplug