From 58e7088628a362fe9d3163429a12e5f828b5b200 Mon Sep 17 00:00:00 2001
From: Jason Ekstrand <jason@jlekstrand.net>
Date: Tue, 3 Nov 2020 22:46:14 -0600
Subject: [PATCH] nir/find_array_copies: Don't assume all children exist

Fixes: 9f3c595dfc4cd "nir/find_array_copies: Handle cast derefs"
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7437>
---
 src/compiler/nir/nir_opt_find_array_copies.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/compiler/nir/nir_opt_find_array_copies.c b/src/compiler/nir/nir_opt_find_array_copies.c
index 5c0fede765b..86ab25b9560 100644
--- a/src/compiler/nir/nir_opt_find_array_copies.c
+++ b/src/compiler/nir/nir_opt_find_array_copies.c
@@ -196,8 +196,10 @@ _foreach_child(match_cb cb, struct match_node *node, struct match_state *state)
    if (node->num_children == 0) {
       cb(node, state);
    } else {
-      for (unsigned i = 0; i < node->num_children; i++)
-         _foreach_child(cb, node->children[i], state);
+      for (unsigned i = 0; i < node->num_children; i++) {
+         if (node->children[i])
+            _foreach_child(cb, node->children[i], state);
+      }
    }
 }