lib-mail: Add assert to ensure we don't overstep in input_idx_need_encoding

Satisfies static analysers.

diff --git a/src/lib-mail/message-header-encode.c b/src/lib-mail/message-header-encode.c
index 38cb86b2454653c3a9a1790b6a2ff95808ac374a..35454aa67b703b45ab2bd517fa691c19fa5565c2 100644 (file)
--- a/src/lib-mail/message-header-encode.c
+++ b/src/lib-mail/message-header-encode.c
@@ -25,6 +25,7 @@ static bool input_idx_need_encoding(const unsigned char *input,
                        /* trailing LF - we need to drop it */
                        return TRUE;
                }
+               i_assert(i+1 < len);
                if (input[i+1] != '\t' && input[i+1] != ' ') {
                        /* LF not followed by whitespace - we need to
                           add the whitespace */