From: Johannes Berg <johannes.berg@xxxxxxxxx> [ Upstream commit efc0ec5afb6e1488b3bdc4bbf85533d79d7e5f9f ] The MPDU contained in a notification shouldn't be larger than the notification size itself is, validate this. Reported-by: Haggai Abramovsky <haggai.abramovsky@xxxxxxxxx> Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx> Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx> Link: https://lore.kernel.org/r/iwlwifi.20201209231352.7c721ad37014.Id5746874ecfa208b60baa62691b2d9dc5dd4d89c@changeid Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/net/wireless/intel/iwlwifi/dvm/rx.c | 10 ++++++++-- drivers/net/wireless/intel/iwlwifi/mvm/rx.c | 8 +++++++- drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c | 6 ++++++ 3 files changed, 21 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/rx.c b/drivers/net/wireless/intel/iwlwifi/dvm/rx.c index 673d60784bfad..b930816ca5ca9 100644 --- a/drivers/net/wireless/intel/iwlwifi/dvm/rx.c +++ b/drivers/net/wireless/intel/iwlwifi/dvm/rx.c @@ -3,7 +3,7 @@ * * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved. * Copyright(c) 2015 Intel Deutschland GmbH - * Copyright(c) 2018 Intel Corporation + * Copyright(c) 2018, 2020 Intel Corporation * * Portions of this file are derived from the ipw3945 project, as well * as portionhelp of the ieee80211 subsystem header files. @@ -786,7 +786,7 @@ static void iwlagn_rx_reply_rx(struct iwl_priv *priv, struct iwl_rx_phy_res *phy_res; __le32 rx_pkt_status; struct iwl_rx_mpdu_res_start *amsdu; - u32 len; + u32 len, pkt_len = iwl_rx_packet_len(pkt); u32 ampdu_status; u32 rate_n_flags; @@ -798,6 +798,12 @@ static void iwlagn_rx_reply_rx(struct iwl_priv *priv, amsdu = (struct iwl_rx_mpdu_res_start *)pkt->data; header = (struct ieee80211_hdr *)(pkt->data + sizeof(*amsdu)); len = le16_to_cpu(amsdu->byte_count); + + if (unlikely(len + sizeof(*amsdu) + sizeof(__le32) > pkt_len)) { + IWL_DEBUG_DROP(priv, "FW lied about packet len\n"); + return; + } + rx_pkt_status = *(__le32 *)(pkt->data + sizeof(*amsdu) + len); ampdu_status = iwlagn_translate_rx_status(priv, le32_to_cpu(rx_pkt_status)); diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rx.c b/drivers/net/wireless/intel/iwlwifi/mvm/rx.c index 77b8def26edb2..47d38df78439b 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/rx.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/rx.c @@ -349,7 +349,7 @@ void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi, struct iwl_rx_mpdu_res_start *rx_res; struct ieee80211_sta *sta = NULL; struct sk_buff *skb; - u32 len; + u32 len, pkt_len = iwl_rx_packet_payload_len(pkt); u32 rate_n_flags; u32 rx_pkt_status; u8 crypt_len = 0; @@ -358,6 +358,12 @@ void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi, rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data; hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res)); len = le16_to_cpu(rx_res->byte_count); + + if (unlikely(len + sizeof(*rx_res) + sizeof(__le32) > pkt_len)) { + IWL_DEBUG_DROP(mvm, "FW lied about packet len\n"); + return; + } + rx_pkt_status = get_unaligned_le32((__le32 *) (pkt->data + sizeof(*rx_res) + len)); diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c index a6e2a30eb3109..d0bfcee59a3a7 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c @@ -1553,6 +1553,7 @@ void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi, struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; struct ieee80211_hdr *hdr; u32 len = le16_to_cpu(desc->mpdu_len); + u32 pkt_len = iwl_rx_packet_payload_len(pkt); u32 rate_n_flags, gp2_on_air_rise; u16 phy_info = le16_to_cpu(desc->phy_info); struct ieee80211_sta *sta = NULL; @@ -1599,6 +1600,11 @@ void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi, le32_get_bits(phy_data.d1, IWL_RX_PHY_DATA1_INFO_TYPE_MASK); + if (len + desc_size > pkt_len) { + IWL_DEBUG_DROP(mvm, "FW lied about packet len\n"); + return; + } + hdr = (void *)(pkt->data + desc_size); /* Dont use dev_alloc_skb(), we'll have enough headroom once * ieee80211_hdr pulled. -- 2.27.0
