[jit] Avoid a crash if constrained_gsharedvt_call_setup () fails.

diff --git a/mono/mini/jit-icalls.c b/mono/mini/jit-icalls.c
index e69381bcffcbb5c24ae9c795247939eba47bb66e..6437da54c2a290274262250d14f5c60eb9a44458 100644 (file)
--- a/mono/mini/jit-icalls.c
+++ b/mono/mini/jit-icalls.c
@@ -1256,6 +1256,8 @@ mono_gsharedvt_constrained_call (gpointer mp, MonoMethod *cmethod, MonoClass *kl
        gpointer new_args [16];
 
        m = constrained_gsharedvt_call_setup (mp, cmethod, klass, &this_arg);
+       if (!m)
+               return NULL;
        if (args && deref_arg) {
                new_args [0] = *(gpointer*)args [0];
                args = new_args;