[PATCH OLK-6.6 0/1] drm: fix free illegal pointer when create drm_property_blob failed

we get (Unable to handle kernel NULL pointer dereference at virtual address 000000000000000c) when call drm_property_blob_put(). After analysis, we get the following process: alloc failed: drm_atomic_set_mode_for_crtc() drm_property_create_blob() // failed state->mode_blob = ERR_PTR(-ENOMEM) free illegal pointer: __drm_atomic_helper_crtc_destroy_state() drm_property_blob_put(state->mode_blob) drm_mode_object_put(&blob->base); // here blob is ERR_PTR(-ENOMEM) So do we have to determine if blob is an error code before calling drm_mode_object_put().

Fixes: 6bcacf51d050 (drm: Add reference counting to blob properties)

drivers/gpu/drm/drm_property.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)