The bus probe and remove functions (dax_bus_probe and dax_bus_remove
respectively) call these functions without checking them to be non-NULL.
Add a check to prevent a NULL pointer exception.
Signed-off-by: Uwe Kleine-König <u...@kleine-koenig.org>
---
drivers/dax/bus.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
index 737b207c9e30..618d462975ba 100644
--- a/drivers/dax/bus.c
+++ b/drivers/dax/bus.c
@@ -1392,6 +1392,14 @@ int __dax_driver_register(struct dax_device_driver
*dax_drv,
struct device_driver *drv = &dax_drv->drv;
int rc = 0;
+ /*
+ * dax_bus_probe() calls dax_drv->probe() unconditionally and
+ * dax_bus_remove() calls dax_drv->remove() unconditionally. So better
+ * be safe than sorry and ensure these are provided.
+ */
+ if (!dax_drv->probe || !dax_drv->remove)
+ return -EINVAL;
+
INIT_LIST_HEAD(&dax_drv->ids);
drv->owner = module;
drv->name = mod_name;
base-commit: 5c8fe583cce542aa0b84adc939ce85293de36e5e
--
2.29.2
