From 77512e6a11657a5353477a59325031f1c0609116 Mon Sep 17 00:00:00 2001 From: Ben Pfaff Date: Thu, 11 Feb 2010 12:26:45 -0800 Subject: [PATCH] vconn: When validating OpenFlow actions always check for bad length. This code was previously unreachable, but it makes sense to check the action length before looking at the action any further. This doesn't fix an actual bug--actions were always properly validated. Also, rephrase a few of the switch cases to make it even more obvious that they always return. Reported-by: Jean Tourrilhes --- lib/vconn.c | 33 ++++++++++++--------------------- 1 file changed, 12 insertions(+), 21 deletions(-) diff --git a/lib/vconn.c b/lib/vconn.c index f72dbe3e..d2015897 100644 --- a/lib/vconn.c +++ b/lib/vconn.c @@ -1255,10 +1255,7 @@ check_action(const union ofp_action *a, unsigned int len, int max_ports) switch (ntohs(a->type)) { case OFPAT_OUTPUT: error = check_action_port(ntohs(a->output.port), max_ports); - if (error) { - return error; - } - return check_action_exact_len(a, len, 8); + return error ? error : check_action_exact_len(a, len, 8); case OFPAT_SET_VLAN_VID: case OFPAT_SET_VLAN_PCP: @@ -1274,29 +1271,15 @@ check_action(const union ofp_action *a, unsigned int len, int max_ports) return check_action_exact_len(a, len, 16); case OFPAT_VENDOR: - if (a->vendor.vendor == htonl(NX_VENDOR_ID)) { - return check_nicira_action(a, len); - } else { - return ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_VENDOR); - } - break; + return (a->vendor.vendor == htonl(NX_VENDOR_ID) + ? check_nicira_action(a, len) + : ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_VENDOR)); default: VLOG_WARN_RL(&bad_ofmsg_rl, "unknown action type %"PRIu16, ntohs(a->type)); return ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_TYPE); } - - if (!len) { - VLOG_DBG_RL(&bad_ofmsg_rl, "action has invalid length 0"); - return ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_LEN); - } - if (len % ACTION_ALIGNMENT) { - VLOG_DBG_RL(&bad_ofmsg_rl, "action length %u is not a multiple of %d", - len, ACTION_ALIGNMENT); - return ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_LEN); - } - return 0; } int @@ -1316,7 +1299,15 @@ validate_actions(const union ofp_action *actions, size_t n_actions, "action requires %u slots but only %u remain", n_slots, slots_left); return ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_LEN); + } else if (!len) { + VLOG_DBG_RL(&bad_ofmsg_rl, "action has invalid length 0"); + return ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_LEN); + } else if (len % ACTION_ALIGNMENT) { + VLOG_DBG_RL(&bad_ofmsg_rl, "action length %u is not a multiple " + "of %d", len, ACTION_ALIGNMENT); + return ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_LEN); } + error = check_action(a, len, max_ports); if (error) { return error; -- 2.30.2