check return code so we don't encode negative numbers

diff --git a/src/protocols/internal/encode.c b/src/protocols/internal/encode.c
index ee9be2ef377b50dfb78b6a3e40a9ccb14624df8c..58fb3ee27ce05bcc027c3354650f4ea0d687f854 100644 (file)
--- a/src/protocols/internal/encode.c
+++ b/src/protocols/internal/encode.c
@@ -111,6 +111,7 @@ static ssize_t internal_encode(fr_dbuff_t *dbuff,
         *      integer to the encoding byte.
         */
        flen = fr_dbuff_uint64v_in(dbuff, da->attr);
+       if (flen <= 0) return flen;
        enc_field[0] |= ((flen - 1) << 5);
 
        /*