[librsvg: 2/6] (#343): Handle child being in error in feComponentTransfer

[Federico Mena Quintero <federico src gnome org>]

commit 76d9a7ceda62977ba8956342fd02f28354a2f610
Author: Ivan Molodetskikh <yalterz gmail com>
Date:   Tue Sep 25 11:34:54 2018 +0300

    (#343): Handle child being in error in feComponentTransfer
    
    https://gitlab.gnome.org/GNOME/librsvg/issues/343

 rsvg_internals/src/filters/component_transfer.rs                 | 9 +++++++++
 .../render-crash/343-feComponentTransfer-child-in-error.svg      | 9 +++++++++
 2 files changed, 18 insertions(+)
---
diff --git a/rsvg_internals/src/filters/component_transfer.rs 
b/rsvg_internals/src/filters/component_transfer.rs
index 7dc7c10b..863a5f34 100644
--- a/rsvg_internals/src/filters/component_transfer.rs
+++ b/rsvg_internals/src/filters/component_transfer.rs
@@ -309,6 +309,15 @@ impl Filter for ComponentTransfer {
         let func_b = get_node(Channel::B);
         let func_a = get_node(Channel::A);
 
+        for node in [&func_r, &func_g, &func_b, &func_a]
+            .iter()
+            .filter_map(|x| x.as_ref())
+        {
+            if node.is_in_error() {
+                return Err(FilterError::ChildNodeInError);
+            }
+        }
+
         // This is the default node that performs an identity transformation.
         let func_default = FuncX::default();
 
diff --git a/tests/fixtures/render-crash/343-feComponentTransfer-child-in-error.svg 
b/tests/fixtures/render-crash/343-feComponentTransfer-child-in-error.svg
new file mode 100644
index 00000000..e6991a2f
--- /dev/null
+++ b/tests/fixtures/render-crash/343-feComponentTransfer-child-in-error.svg
@@ -0,0 +1,9 @@
+<svg>
+  <filter id="f">
+    <feComponentTransfer>
+      <feFuncR type="table" tableValues="@"/>
+    </feComponentTransfer>
+  </filter>
+
+  <text filter="url(#f)">0</text>
+</svg>