When a region is disabled, there is no driver attached. Therefore
dev->driverdata is NULL. An attempt to write to regionN/deep_flush via sysfs
would cause a NULL pointer dereference. Bail when dev->driver is NULL to
protect this scenario.
Fix: ab630891ce0eb(libnvdimm, region: sysfs trigger for nvdimm_flush())
Signed-off-by: Dave Jiang <dave.ji...@intel.com>
---
v2: Move to deep_flush_store. (Dan)
drivers/nvdimm/region_devs.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index a612be6f019d..65cc2a5b48b8 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -290,6 +290,11 @@ static ssize_t deep_flush_store(struct device *dev, struct
device_attribute *att
return rc;
if (!flush)
return -EINVAL;
+
+ /* protect against disabled region */
+ if (!nd_region->dev.driver)
+ return -ENXIO;
+
nvdimm_flush(nd_region);
return len;
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