Consistently check for Content-Length value

This commit makes sure to consistently check that the content length
is not set above 2GB. Previously it was only checked in
setContentLength.

Closes gh-33256

Author: snicoll

spring-web/src/main/java/org/springframework/web/util/ContentCachingResponseWrapper.java

@@ -140,11 +140,15 @@ public void setContentLength(int len) {
 
 	@Override
 	public void setContentLengthLong(long len) {
-		if (len > Integer.MAX_VALUE) {
+		setContentLength(toContentLengthInt(len));
+	}
+
+	private int toContentLengthInt(long contentLength) {
+		if (contentLength > Integer.MAX_VALUE) {
 			throw new IllegalArgumentException("Content-Length exceeds ContentCachingResponseWrapper's maximum (" +
-					Integer.MAX_VALUE + "): " + len);
+					Integer.MAX_VALUE + "): " + contentLength);
 		}
-		setContentLength((int) len);
+		return (int) contentLength;
 	}
 
 	@Override
@@ -160,7 +164,7 @@ public boolean containsHeader(String name) {
 	@Override
 	public void setHeader(String name, String value) {
 		if (HttpHeaders.CONTENT_LENGTH.equalsIgnoreCase(name)) {
-			this.contentLength = Integer.valueOf(value);
+			this.contentLength = toContentLengthInt(Long.parseLong(value));
 		}
 		else {
 			super.setHeader(name, value);
@@ -170,7 +174,7 @@ public void setHeader(String name, String value) {
 	@Override
 	public void addHeader(String name, String value) {
 		if (HttpHeaders.CONTENT_LENGTH.equalsIgnoreCase(name)) {
-			this.contentLength = Integer.valueOf(value);
+			this.contentLength = toContentLengthInt(Long.parseLong(value));
 		}
 		else {
 			super.addHeader(name, value);
@@ -180,7 +184,7 @@ public void addHeader(String name, String value) {
 	@Override
 	public void setIntHeader(String name, int value) {
 		if (HttpHeaders.CONTENT_LENGTH.equalsIgnoreCase(name)) {
-			this.contentLength = Integer.valueOf(value);
+			this.contentLength = value;
 		}
 		else {
 			super.setIntHeader(name, value);
@@ -190,7 +194,7 @@ public void setIntHeader(String name, int value) {
 	@Override
 	public void addIntHeader(String name, int value) {
 		if (HttpHeaders.CONTENT_LENGTH.equalsIgnoreCase(name)) {
-			this.contentLength = Integer.valueOf(value);
+			this.contentLength = value;
 		}
 		else {
 			super.addIntHeader(name, value);

spring-web/src/test/java/org/springframework/web/filter/ContentCachingResponseWrapperTests.java

@@ -31,6 +31,7 @@
 
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
 import static org.junit.jupiter.api.Named.named;
 import static org.springframework.http.HttpHeaders.CONTENT_LENGTH;
 import static org.springframework.http.HttpHeaders.CONTENT_TYPE;
@@ -233,6 +234,43 @@ void copyBodyToResponseWithTransferEncoding() throws Exception {
 		assertThat(response.getContentAsByteArray()).isEqualTo(responseBody);
 	}
 
+	@Test
+	void setContentLengthAbove2GbViaSetContentLengthLong() {
+		MockHttpServletResponse response = new MockHttpServletResponse();
+
+		ContentCachingResponseWrapper responseWrapper = new ContentCachingResponseWrapper(response);
+		long overflow = (long) Integer.MAX_VALUE + 1;
+		assertThatIllegalArgumentException()
+				.isThrownBy(() -> responseWrapper.setContentLengthLong(overflow))
+				.withMessageContaining("Content-Length exceeds ContentCachingResponseWrapper's maximum")
+				.withMessageContaining(String.valueOf(overflow));
+	}
+
+	@Test
+	void setContentLengthAbove2GbViaAddHeader() {
+		MockHttpServletResponse response = new MockHttpServletResponse();
+
+		ContentCachingResponseWrapper responseWrapper = new ContentCachingResponseWrapper(response);
+		String overflow = String.valueOf((long) Integer.MAX_VALUE + 1);
+		assertThatIllegalArgumentException()
+				.isThrownBy(() -> responseWrapper.addHeader(CONTENT_LENGTH, overflow))
+				.withMessageContaining("Content-Length exceeds ContentCachingResponseWrapper's maximum")
+				.withMessageContaining(overflow);
+	}
+
+	@Test
+	void setContentLengthAbove2GbViaSetHeader() {
+		MockHttpServletResponse response = new MockHttpServletResponse();
+
+		ContentCachingResponseWrapper responseWrapper = new ContentCachingResponseWrapper(response);
+		String overflow = String.valueOf((long) Integer.MAX_VALUE + 1);
+		assertThatIllegalArgumentException()
+				.isThrownBy(() -> responseWrapper.setHeader(CONTENT_LENGTH, overflow))
+				.withMessageContaining("Content-Length exceeds ContentCachingResponseWrapper's maximum")
+				.withMessageContaining(overflow);
+	}
+
+
 	private void assertHeader(HttpServletResponse response, String header, int value) {
 		assertHeader(response, header, Integer.toString(value));
 	}