src/mime/multipart/formdata.go | 4 +++-

diff --git a/src/mime/multipart/formdata.go b/src/mime/multipart/formdata.go
index eee53fc8dd0574fa376bd38a5c4ecbe7ef76da22..806b46049ecdfa978f3b1fe1288b309442c7ed9f 100644
--- a/src/mime/multipart/formdata.go
+++ b/src/mime/multipart/formdata.go
@@ -75,8 +75,10 @@ 			file, err := ioutil.TempFile("", "multipart-")
 			if err != nil {
 				return nil, err
 			}
-			defer file.Close()
 			_, err = io.Copy(file, io.MultiReader(&b, p))
+			if cerr := file.Close(); err == nil {
+				err = cerr
+			}
 			if err != nil {
 				os.Remove(file.Name())
 				return nil, err