wimlib_create_new_wim(): check for NULL wim_ret

diff --git a/src/wim.c b/src/wim.c
index a66d5cce1c16462670515398af70de3fd4993df3..9b776023dd326d16f6f617bb3dcd61430a4d97b2 100644 (file)
--- a/src/wim.c
+++ b/src/wim.c
@@ -202,6 +202,9 @@ wimlib_create_new_wim(int ctype, WIMStruct **wim_ret)
        if (ret)
                return ret;
 
+       if (!wim_ret)
+               return WIMLIB_ERR_INVALID_PARAM;
+
        wim = new_wim_struct();
        if (!wim)
                return WIMLIB_ERR_NOMEM;