From b570e5b0592a56c5990ae3aa0fdb93dd9b545d43 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 9 Dec 2020 23:16:40 +0200 Subject: [PATCH] iwlwifi: mvm: validate firmware sync response size We send some data to the firmware and expect to get it back, but we shouldn't really trust the firmware on this. Check the size of all the data we send down to avoid using bad or just uninitialized data when the firmware doesn't respond right. Signed-off-by: Johannes Berg Signed-off-by: Luca Coelho Link: https://lore.kernel.org/r/iwlwifi.20201209231352.a5a8173f16c7.I4fa68bb2b1c7dcc52ddd381c4042722d27c4a34d@changeid Signed-off-by: Luca Coelho --- drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c index b27aa4760347..e4f73b6cd94c 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c @@ -747,10 +747,18 @@ void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct napi_struct *napi, struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_rxq_sync_notification *notif; struct iwl_mvm_internal_rxq_notif *internal_notif; + u32 len = iwl_rx_packet_payload_len(pkt); notif = (void *)pkt->data; internal_notif = (void *)notif->payload; + if (WARN_ONCE(len < sizeof(*notif) + sizeof(*internal_notif), + "invalid notification size %d (%d)", + len, (int)(sizeof(*notif) + sizeof(*internal_notif)))) + return; + /* remove only the firmware header, we want all of our payload below */ + len -= sizeof(*notif); + if (internal_notif->sync && mvm->queue_sync_cookie != internal_notif->cookie) { WARN_ONCE(1, "Received expired RX queue sync message\n"); @@ -759,11 +767,22 @@ void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct napi_struct *napi, switch (internal_notif->type) { case IWL_MVM_RXQ_EMPTY: + WARN_ONCE(len != sizeof(*internal_notif), + "invalid empty notification size %d (%d)", + len, (int)sizeof(*internal_notif)); break; case IWL_MVM_RXQ_NOTIF_DEL_BA: + if (WARN_ONCE(len != sizeof(struct iwl_mvm_rss_sync_notif), + "invalid delba notification size %d (%d)", + len, (int)sizeof(struct iwl_mvm_rss_sync_notif))) + break; iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data); break; case IWL_MVM_RXQ_NSSN_SYNC: + if (WARN_ONCE(len != sizeof(struct iwl_mvm_rss_sync_notif), + "invalid nssn sync notification size %d (%d)", + len, (int)sizeof(struct iwl_mvm_rss_sync_notif))) + break; iwl_mvm_nssn_sync(mvm, napi, queue, (void *)internal_notif->data); break; -- 2.50.1