print the correct amount of data remaining

diff --git a/src/protocols/tacacs/decode.c b/src/protocols/tacacs/decode.c
index b67476d0cf6615602d59cd4ba71438569a3b6270..03332b902e9733479c8445fa7c1fb9ca48179932 100644 (file)
--- a/src/protocols/tacacs/decode.c
+++ b/src/protocols/tacacs/decode.c
@@ -133,7 +133,7 @@ int fr_tacacs_packet_to_code(fr_tacacs_packet_t const *pkt)
 
 #define ARG_COUNT_CHECK(_msg, _arg_cnt) do { \
        if ((p + _arg_cnt) > end) { \
-               fr_strerror_printf("Argument count %u overflows the remaining data in the %s packet", _arg_cnt, _msg); \
+               fr_strerror_printf("Argument count %u overflows the remaining data (%zu) in the %s packet", _arg_cnt, end - p, _msg); \
                goto fail; \
        } \
        p += _arg_cnt; \
@@ -174,7 +174,7 @@ static int tacacs_decode_args(TALLOC_CTX *ctx, fr_pair_list_t *out, fr_dict_attr
        if (!arg_cnt) return 0;
 
        if ((p + arg_cnt) > end) {
-               fr_strerror_printf("Argument count %u overflows the remaining data in the packet", arg_cnt);
+               fr_strerror_printf("Argument count %u overflows the remaining data (%zu) in the packet", arg_cnt, p - end);
                return -1;
        }
 
@@ -307,7 +307,7 @@ static int tacacs_decode_field(TALLOC_CTX *ctx, fr_pair_list_t *out, fr_dict_att
 
        if ((p + field_len) > end) {
                fr_strerror_printf("'%s' length %u overflows the remaining data (%zu) in the packet",
-                                  da->name, field_len, p - end);
+                                  da->name, field_len, end - p);
                return -1;
        }