Apply auto-grow collection limit to direct field binding

spring-context/src/main/java/org/springframework/validation/DataBinder.java

@@ -341,7 +341,7 @@ public void initDirectFieldAccess() {
 	 */
 	protected AbstractPropertyBindingResult createDirectFieldBindingResult() {
 		DirectFieldBindingResult result = new DirectFieldBindingResult(getTarget(),
-				getObjectName(), isAutoGrowNestedPaths());
+				getObjectName(), isAutoGrowNestedPaths(), getAutoGrowCollectionLimit());
 
 		if (this.conversionService != null) {
 			result.initConversion(this.conversionService);

spring-context/src/main/java/org/springframework/validation/DirectFieldBindingResult.java

@@ -19,6 +19,7 @@
 import org.jspecify.annotations.Nullable;
 
 import org.springframework.beans.ConfigurablePropertyAccessor;
+import org.springframework.beans.DirectFieldAccessor;
 import org.springframework.beans.PropertyAccessorFactory;
 
 /**
@@ -41,6 +42,8 @@ public class DirectFieldBindingResult extends AbstractPropertyBindingResult {
 
 	private final boolean autoGrowNestedPaths;
 
+	private final int autoGrowCollectionLimit;
+
 	private transient @Nullable ConfigurablePropertyAccessor directFieldAccessor;
 
 
@@ -60,9 +63,24 @@ public DirectFieldBindingResult(@Nullable Object target, String objectName) {
 	 * @param autoGrowNestedPaths whether to "auto-grow" a nested path that contains a null value
 	 */
 	public DirectFieldBindingResult(@Nullable Object target, String objectName, boolean autoGrowNestedPaths) {
+		this(target, objectName, autoGrowNestedPaths, Integer.MAX_VALUE);
+	}
+
+	/**
+	 * Create a new {@code DirectFieldBindingResult} for the given target.
+	 * @param target the target object to bind onto
+	 * @param objectName the name of the target object
+	 * @param autoGrowNestedPaths whether to "auto-grow" a nested path that contains a null value
+	 * @param autoGrowCollectionLimit the limit for array and collection auto-growing
+	 * @since 7.1
+	 */
+	public DirectFieldBindingResult(@Nullable Object target, String objectName,
+			boolean autoGrowNestedPaths, int autoGrowCollectionLimit) {
+
 		super(objectName);
 		this.target = target;
 		this.autoGrowNestedPaths = autoGrowNestedPaths;
+		this.autoGrowCollectionLimit = autoGrowCollectionLimit;
 	}
 
 
@@ -82,6 +100,7 @@ public final ConfigurablePropertyAccessor getPropertyAccessor() {
 			this.directFieldAccessor = createDirectFieldAccessor();
 			this.directFieldAccessor.setExtractOldValueForEditor(true);
 			this.directFieldAccessor.setAutoGrowNestedPaths(this.autoGrowNestedPaths);
+			((DirectFieldAccessor) this.directFieldAccessor).setAutoGrowCollectionLimit(this.autoGrowCollectionLimit);
 		}
 		return this.directFieldAccessor;
 	}

spring-context/src/test/java/org/springframework/validation/DataBinderFieldAccessTests.java

@@ -17,10 +17,12 @@
 package org.springframework.validation;
 
 import java.beans.PropertyEditorSupport;
+import java.util.List;
 import java.util.Map;
 
 import org.junit.jupiter.api.Test;
 
+import org.springframework.beans.InvalidPropertyException;
 import org.springframework.beans.MutablePropertyValues;
 import org.springframework.beans.NotWritablePropertyException;
 import org.springframework.beans.NullValueInNestedPathException;
@@ -134,6 +136,25 @@ void nestedBindingWithDisabledAutoGrow() {
 				binder.bind(pvs));
 	}
 
+	@Test
+	void directFieldAccessHonorsDefaultAutoGrowCollectionLimit() {
+		FieldAccessForm target = new FieldAccessForm();
+		DataBinder binder = new DataBinder(target);
+		binder.initDirectFieldAccess();
+
+		MutablePropertyValues pvs = new MutablePropertyValues();
+		pvs.add("items[255].name", "value");
+		binder.bind(pvs);
+
+		assertThat(target.items).hasSize(256);
+		assertThat(target.items.get(255).name).isEqualTo("value");
+
+		MutablePropertyValues outOfBounds = new MutablePropertyValues();
+		outOfBounds.add("items[256].name", "too-far");
+		assertThatExceptionOfType(InvalidPropertyException.class).isThrownBy(() ->
+				binder.bind(outOfBounds));
+	}
+
 	@Test
 	void bindingWithErrorsAndCustomEditors() {
 		FieldAccessBean rod = new FieldAccessBean();
@@ -176,4 +197,16 @@ public String getAsText() {
 				assertThat(tb.getSpouse()).isNotNull();
 			});
 	}
+
+
+	static class FieldAccessForm {
+
+		public List<FieldAccessItem> items;
+	}
+
+
+	static class FieldAccessItem {
+
+		public String name;
+	}
 }