lib-mail: test-istream-attachment - Avoid unsigned overflow in size calculation

diff --git a/src/lib-mail/test-istream-attachment.c b/src/lib-mail/test-istream-attachment.c
index 26cf2340f8d1ad88e1ec52dd0b116ffe9dea993e..74887e84f6e88f59167d45c80d51471dae593240 100644 (file)
--- a/src/lib-mail/test-istream-attachment.c
+++ b/src/lib-mail/test-istream-attachment.c
@@ -303,8 +303,8 @@ static int test_input_stream(struct istream *file_input)
        /* try with a wrong message size */
        for (int i = 0; i < 2; i++) {
                input2 = i_stream_create_from_data(base_buf->data, base_buf->used);
-               input = test_build_original_istream(input2, orig_msg_size +
-                                                   (i == 0 ? 1 : -1));
+               input = test_build_original_istream(input2,
+                               i == 0 ? orig_msg_size + 1 : orig_msg_size - 1);
                i_stream_unref(&input2);
                while (i_stream_read_more(input, &data, &size) > 0)
                        i_stream_skip(input, size);