manson-hcs-3xxx: fix potential NULL dereference

Check pointers' validity before dereferencing them.

This was reported by clang's scan-build.

diff --git a/src/hardware/manson-hcs-3xxx/api.c b/src/hardware/manson-hcs-3xxx/api.c
index 92240cea30dc78251f86c6b7dd7516f8c3a609c4..765d9abc78682a905cde53a680cab51ae7fd0414 100644 (file)
--- a/src/hardware/manson-hcs-3xxx/api.c
+++ b/src/hardware/manson-hcs-3xxx/api.c
@@ -281,10 +281,14 @@ static int config_list(uint32_t key, GVariant **data,
        case SR_CONF_DEVICE_OPTIONS:
                return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
        case SR_CONF_VOLTAGE_TARGET:
+               if (!devc || !devc->model)
+                       return SR_ERR_ARG;
                a = devc->model->voltage;
                *data = std_gvar_min_max_step(a[0], devc->voltage_max_device, a[2]);
                break;
        case SR_CONF_CURRENT_LIMIT:
+               if (!devc || !devc->model)
+                       return SR_ERR_ARG;
                a = devc->model->current;
                *data = std_gvar_min_max_step(a[0], devc->current_max_device, a[2]);
                break;