[PATCH i-g-t v3 2/2] tests/intel/i915_pm_rpm: check drmModeGetConnector() before use

[Luca Coelho]

The drmModeGetConnector() function can return NULL in some cases, so
we need to check the return value before accessing it.  This is not
being checked in init_mode_set_data(), so fix that.

>From the bug report:

Starting subtest: module-reload
Received signal SIGSEGV.
Stack trace:

Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/10911
Cc: Kamil Konieczny <kamil.konieczny at linux.intel.com>
Cc: Bhanuprakash Modem <bhanuprakash.modem at intel.com>
Cc: Jani Saarinen <jani.saarinen at intel.com>
Cc: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>
Signed-off-by: Luca Coelho <luciano.coelho at intel.com>
---
 tests/intel/i915_pm_rpm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tests/intel/i915_pm_rpm.c b/tests/intel/i915_pm_rpm.c
index 0ea5fbd8afd9..e0f395fa8a84 100644
--- a/tests/intel/i915_pm_rpm.c
+++ b/tests/intel/i915_pm_rpm.c
@@ -515,6 +515,12 @@ static void init_mode_set_data(struct mode_set_data *data)
 			data->connectors[i] =
 				drmModeGetConnector(drm_fd,
 						    data->res->connectors[i]);
+			if (!data->connectors[i]) {
+				igt_warn("Could not read connector %u\n",
+					 data->res->connectors[i]);
+				continue;
+			}
+
 			data->edids[i] = get_connector_edid(data->connectors[i], i);
 		}
 
-- 
2.39.2