[PATCH] media: atomisp: avoid ACPI package count underflow in gmin_cfg_get_dsm

[Mohamed El Harake <mohamedharake2006@gmail.com>]

From: Mohamad El Harake <mohamedharake2006@gmail.com>

gmin_cfg_get_dsm() iterates over ACPI _DSM package elements as
key/value pairs using obj->package.count - 1 as the loop bound.

If package.count is 0, the subtraction underflows and may lead
to out-of-bounds access.

Use i + 1 < obj->package.count instead.

Signed-off-by: Mohamad El Harake <mohamedharake2006@gmail.com>
---
 drivers/staging/media/atomisp/pci/atomisp_csi2_bridge.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp_csi2_bridge.c b/drivers/staging/media/atomisp/pci/atomisp_csi2_bridge.c
index ba61cc28fac1..cca91c6d71a5 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_csi2_bridge.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_csi2_bridge.c
@@ -113,7 +113,7 @@ static char *gmin_cfg_get_dsm(struct acpi_device *adev, const char *key)
 	if (!obj)
 		return NULL;
 
-	for (i = 0; i < obj->package.count - 1; i += 2) {
+	for (i = 0; i + 1 < obj->package.count; i += 2) {
 		key_el = &obj->package.elements[i + 0];
 		val_el = &obj->package.elements[i + 1];
 
-- 
2.43.0