[PATCH v4 1/7] cxl/region: Avoid null pointer dereference in is_cxl_region()

[Smita Koralahalli]

Add a NULL check in is_cxl_region() to prevent potential null pointer
dereference if a caller passes a NULL device. This change ensures the
function safely returns false instead of triggering undefined behavior
when dev is NULL.

Co-developed-by: Nathan Fontenot <Nathan.Fontenot@xxxxxxx>
Signed-off-by: Nathan Fontenot <Nathan.Fontenot@xxxxxxx>
Co-developed-by: Terry Bowman <terry.bowman@xxxxxxx>
Signed-off-by: Terry Bowman <terry.bowman@xxxxxxx>
Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@xxxxxxx>
---
 drivers/cxl/core/region.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index c3f4dc244df7..109b8a98c4c7 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -2333,7 +2333,7 @@ const struct device_type cxl_region_type = {
 
 bool is_cxl_region(struct device *dev)
 {
-	return dev->type == &cxl_region_type;
+	return dev && dev->type == &cxl_region_type;
 }
 EXPORT_SYMBOL_NS_GPL(is_cxl_region, "CXL");
 
-- 
2.17.1