From: Matt Corallo <git@bluematt.me>
Date: Sat, 3 Sep 2022 20:24:10 +0000 (+0000)
Subject: [TS+Java] Ensure we don't try to add a reference from `null`.
X-Git-Tag: v0.0.110.1.1~2
X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=commitdiff_plain;h=4568b2bc1e3eb7555d2b5a3450f63698fad9aabc;p=ldk-java

[TS+Java] Ensure we don't try to add a reference from `null`.

At least in `Event::PaymentPathFailed` if we try to map an event
with no `retry` we'll hit a `NullPointerException` as we'll try to
add a reference from the `null` retry back to the `Event` itself.

The simple fix is to simply exhaustively check for `null` before
adding references everywhere.
---

diff --git a/java_strings.py b/java_strings.py
index 63774b5e..8148d0b5 100644
--- a/java_strings.py
+++ b/java_strings.py
@@ -701,7 +701,7 @@ import javax.annotation.Nullable;
         return var + ".ptr" + " = 0;"
 
     def add_ref(self, holder, referent):
-        return holder + ".ptrs_to.add(" + referent + ")"
+        return "if (" + holder + " != null) { " + holder + ".ptrs_to.add(" + referent + "); }"
 
     def fully_qualified_hu_ty_path(self, ty):
         if ty.java_fn_ty_arg.startswith("L") and ty.java_fn_ty_arg.endswith(";"):
diff --git a/typescript_strings.py b/typescript_strings.py
index 765a93cd..347aac69 100644
--- a/typescript_strings.py
+++ b/typescript_strings.py
@@ -341,7 +341,7 @@ export class CommonBase {
 	// In TypeScript, protected means "any subclass can access parent fields on instances of itself"
 	// To work around this, we add accessors for other instances' protected fields here.
 	protected static add_ref_from(holder: CommonBase, referent: object) {
-		holder.ptrs_to.push(referent);
+		if (holder !== null) { holder.ptrs_to.push(referent); }
 	}
 	protected static get_ptr_of(o: CommonBase) {
 		return o.ptr;