Add explicit check for well-formed array descriptor.

Author: raphw

byte-buddy-dep/src/main/java/net/bytebuddy/pool/TypePool.java

@@ -587,9 +587,13 @@ public Resolution describe(String name) {
             }
             if (arity > 0) {
                 String primitiveName = PRIMITIVE_DESCRIPTORS.get(name);
-                name = primitiveName == null
-                        ? name.substring(1, name.length() - 1)
-                        : primitiveName;
+                if (primitiveName != null) {
+                    name = primitiveName;
+                } else if (name.startsWith("L") && name.endsWith(";")) {
+                    name = name.substring(1, name.length() - 1);
+                } else {
+                    throw new IllegalArgumentException("Not a legitimate array type descriptor: " + name);
+                }
             }
             TypeDescription typeDescription = PRIMITIVE_TYPES.get(name);
             Resolution resolution = typeDescription == null

byte-buddy-dep/src/test/java/net/bytebuddy/pool/TypePoolDefaultTest.java

@@ -33,6 +33,21 @@ public void testNameCannotContainSlash() throws Exception {
         typePool.describe("/");
     }
 
+    @Test(expected = IllegalArgumentException.class)
+    public void testArrayNameMustBeDescriptorUnlessPrimitive() throws Exception {
+        typePool.describe("[abc");
+    }
+
+    @Test
+    public void testPrimitiveType() throws Exception {
+        assertThat(typePool.describe("int").resolve().represents(int.class), is(true));
+    }
+
+    @Test
+    public void testPrimitiveTypeArray() throws Exception {
+        assertThat(typePool.describe("[I").resolve().represents(int[].class), is(true));
+    }
+
     @Test(expected = IllegalStateException.class)
     public void testCannotFindClass() throws Exception {
         TypePool.Resolution resolution = typePool.describe("foo");