lib-imap: imap-parser - Fix 8 bit atom check to use unsigned char.

diff --git a/src/lib-imap/imap-parser.c b/src/lib-imap/imap-parser.c
index cc283f5c06fe54528240439f9091a3d7d8521bf3..20cee08c2905eeee0bbda973fc4c06458e1cc3f7 100644 (file)
--- a/src/lib-imap/imap-parser.c
+++ b/src/lib-imap/imap-parser.c
@@ -305,7 +305,7 @@ static bool is_valid_atom_char(struct imap_parser *parser, char chr)
 
        if (IS_ATOM_PARSER_INPUT((unsigned char)chr))
                error_msg = "Invalid characters in atom";
-       else if ((chr & 0x80) != 0)
+       else if ((((unsigned char)chr) & 0x80) != 0)
                error_msg = "8bit data in atom";
        else
                return TRUE;