[PATCH i-g-t 3/3] lib/igt_facts: Fix potential NULL pointer dereference

[Peter Senna Tschudin <peter.senna@linux.intel.com>]

If both udev_device_get_sysattr_value and udev_device_get_sysname fail,
pci_addr will remain NULL, which could lead to issues when using it
later in asprintf. Ignore cards when pci_addr cannot be extracted.

Signed-off-by: Peter Senna Tschudin <peter.senna@linux.intel.com>
---
 lib/igt_facts.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/igt_facts.c b/lib/igt_facts.c
index d38be0726..47a2c98a5 100644
--- a/lib/igt_facts.c
+++ b/lib/igt_facts.c
@@ -537,6 +537,10 @@ static void igt_facts_scan_pci_drm_cards(const char *last_test)
 								 "address");
 			if (!pci_addr)
 				pci_addr = udev_device_get_sysname(pci_dev);
+			if (!pci_addr) {
+				udev_device_unref(drm_dev);
+				continue;
+			}
 		} else {
 			/* Some GPUs are platform devices. Ignore them. */
 			pci_addr = NULL;
-- 
2.43.0