[PATCH] ACPI: scan: Add missing check for kstrdup()

[Jiasheng Jiang]

Add check for the return value of kstrdup() in order to gurantee
the success of allocation.
Moreover, move the code forward to simplify the error handling.

Fixes: ccf78040265b ("ACPI: Add _UID support for ACPI devices.")
Signed-off-by: Jiasheng Jiang <jiashengjiangcool@xxxxxxxxxxx>
---
 drivers/acpi/scan.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index d1464324de95..59246757a207 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1385,6 +1385,15 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
 			return;
 		}
 
+		if (info->valid & ACPI_VALID_UID) {
+			pnp->unique_id = kstrdup(info->unique_id.string,
+							GFP_KERNEL);
+			if (!pnp->unique_id) {
+				kfree(info);
+				return;
+			}
+		}
+
 		if (info->valid & ACPI_VALID_HID) {
 			acpi_add_id(pnp, info->hardware_id.string);
 			pnp->type.platform_id = 1;
@@ -1398,9 +1407,6 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
 			pnp->bus_address = info->address;
 			pnp->type.bus_address = 1;
 		}
-		if (info->valid & ACPI_VALID_UID)
-			pnp->unique_id = kstrdup(info->unique_id.string,
-							GFP_KERNEL);
 		if (info->valid & ACPI_VALID_CLS)
 			acpi_add_id(pnp, info->class_code.string);
 
-- 
2.25.1