[PATCH] fix: drivers/video: __screen_info_pci_dev: leaked pci_dev references in pci_get_base_class loop

[WenTao Liang <vulab@iscas.ac.cn>]

In __screen_info_pci_dev(), the loop uses pci_get_base_class() with a
non-NULL starting device pdev. Each iteration returns a new device
reference but does not release the previous one. When a non-matching
device is found, pdev is overwritten and the previous reference leaks.
When no match is found, all acquired references are leaked.

Add pci_dev_put(pdev) for non-matching devices before continuing the loop.

Cc: stable@vger.kernel.org
Fixes: 036105e3a776 ("video: Provide screen_info_get_pci_dev() to find screen_info's PCI device")
Signed-off-by: WenTao Liang <vulab@iscas.ac.cn>
---
 drivers/video/screen_info_pci.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/video/screen_info_pci.c b/drivers/video/screen_info_pci.c
index 8f34d8a74f09..c821101e9304 100644
--- a/drivers/video/screen_info_pci.c
+++ b/drivers/video/screen_info_pci.c
@@ -123,6 +123,10 @@ static struct pci_dev *__screen_info_pci_dev(struct resource *res)
 
 	while (!r && (pdev = pci_get_base_class(PCI_BASE_CLASS_DISPLAY, pdev))) {
 		r = pci_find_resource(pdev, res);
+		if (!r) {
+			pci_dev_put(pdev);
+			pdev = NULL;
+		}
 	}
 
 	return pdev;
-- 
2.39.5 (Apple Git-154)