[Intel-gfx] [PATCH 1/5] Fixing Possible Null Pointer Dereference

[Nischal Varide]

There is a possble Null Pointer dereference in intel_atomic.c and this
patch fixes the same by introducting a check to old_state, new_state
old_conn_state and new_conn_state variables.

Signed-off-by: Nischal Varide <nischal.varide at intel.com>
---
 drivers/gpu/drm/i915/display/intel_atomic.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
index 630f49b7aa01..ab58f061c8a7 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic.c
@@ -132,6 +132,9 @@ int intel_digital_connector_atomic_check(struct drm_connector *conn,
 		to_intel_digital_connector_state(old_state);
 	struct drm_crtc_state *crtc_state;
 
+	if (!(new_state && new_conn_state && old_state && old_conn_state))
+		return 0;
+
 	intel_hdcp_atomic_check(conn, old_state, new_state);
 	intel_psr_atomic_check(conn, old_state, new_state);
 
@@ -192,6 +195,8 @@ intel_connector_needs_modeset(struct intel_atomic_state *state,
 
 	old_conn_state = drm_atomic_get_old_connector_state(&state->base, connector);
 	new_conn_state = drm_atomic_get_new_connector_state(&state->base, connector);
+	if (!(old_conn_state && new_conn_state))
+		return 0;
 
 	return old_conn_state->crtc != new_conn_state->crtc ||
 	       (new_conn_state->crtc &&
-- 
2.26.0