gprs: Handle failure of GPRS context atom drivers

The GRPS context atom drivers can return an error from their probe
callbacks. In that case gc->driver is NULL and will cause a crash
when trying to activate a context. So check that there is actually
a driver attached to that GPRS context.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/gprs.c b/src/gprs.c
index 3f085ed3..f44838a8 100644
--- a/src/gprs.c
+++ b/src/gprs.c
@@ -714,7 +714,8 @@ static DBusMessage *pri_set_property(DBusConnection *conn,
 	if (g_str_equal(property, "Active")) {
 		struct ofono_gprs_context *gc = ctx->gprs->context_driver;
 
-		if (gc == NULL || gc->driver->activate_primary == NULL ||
+		if (gc == NULL || gc->driver == NULL ||
+				gc->driver->activate_primary == NULL ||
 				gc->driver->deactivate_primary == NULL ||
 				ctx->gprs->cid_map == NULL)
 			return __ofono_error_not_implemented(msg);