[PATCH] PNP/ACPI: Fix string truncation warning

[Sunil V L]

LKP reports below warning when building for RISC-V.

drivers/pnp/pnpacpi/core.c:253:17:
warning: 'strncpy' specified bound 50 equals destination
size [-Wstringop-truncation]

This appears like a valid issue since the destination
string may not be null-terminated. To fix this, append
the NUL explicitly after the strncpy.

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202307241942.Rff2Nri5-lkp@xxxxxxxxx/
Signed-off-by: Sunil V L <sunilvl@xxxxxxxxxxxxxxxx>
---
 drivers/pnp/pnpacpi/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c
index 38928ff7472b..6ab272c84b7b 100644
--- a/drivers/pnp/pnpacpi/core.c
+++ b/drivers/pnp/pnpacpi/core.c
@@ -254,6 +254,9 @@ static int __init pnpacpi_add_device(struct acpi_device *device)
 	else
 		strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 
+	/* Handle possible string truncation */
+	dev->name[sizeof(dev->name) - 1] = '\0';
+
 	if (dev->active)
 		pnpacpi_parse_allocated_resource(dev);
 
-- 
2.39.2