In certain cases, hardware might provide packets with a length greater than the maximum native Wi-Fi header length. This can lead to accessing and modifying fields in the header within the ath11k_dp_rx_h_undecap_nwifi() function for the DP_RX_DECAP_TYPE_NATIVE_WIFI decap type and potentially result in invalid data access and memory corruption. Kernel stack is corrupted in: ath11k_dp_rx_h_undecap+0x6b0/0x6b0 [ath11k] Call trace: ath11k_dp_rx_h_mpdu+0x0/0x2e8 [ath11k] ath11k_dp_rx_h_mpdu+0x1e0/0x2e8 [ath11k] ath11k_dp_rx_wbm_err+0x1e0/0x450 [ath11k] ath11k_dp_rx_process_wbm_err+0x2fc/0x460 [ath11k] ath11k_dp_service_srng+0x2e0/0x348 [ath11k] Add a sanity check before processing the SKB to prevent invalid data access in the undecap native Wi-Fi function for the DP_RX_DECAP_TYPE_NATIVE_WIFI decap type. This adapted from the discussion/patch of the ath12k driver [1]. Tested-on: WCN6855 hw2.1 PCI WLAN.HSP.1.1-04685-QCAHSPSWPL_V1_V2_SILICONZ_IOE-1 Link: https://lore.kernel.org/linux-wireless/20250211090302.4105141-1-tamizh.raja@oss.qualcomm.com/ # [1] Signed-off-by: Miaoqing Pan --- drivers/net/wireless/ath/ath11k/dp_rx.c | 50 +++++++++++++++++++++++-- 1 file changed, 47 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c index fe79109adc70..fbe2061a544d 100644 --- a/drivers/net/wireless/ath/ath11k/dp_rx.c +++ b/drivers/net/wireless/ath/ath11k/dp_rx.c @@ -2502,6 +2502,29 @@ static void ath11k_dp_rx_deliver_msdu(struct ath11k *ar, struct napi_struct *nap ieee80211_rx_napi(ar->hw, pubsta, msdu, napi); } +static bool ath11k_dp_rx_check_nwifi_hdr_len_valid(struct ath11k_base *ab, + struct hal_rx_desc *rx_desc, + struct sk_buff *msdu) +{ + struct ieee80211_hdr *hdr; + u8 decap_type; + u32 hdr_len; + + decap_type = ath11k_dp_rx_h_msdu_start_decap_type(ab, rx_desc); + if (decap_type != DP_RX_DECAP_TYPE_NATIVE_WIFI) + return true; + + hdr = (struct ieee80211_hdr *)msdu->data; + hdr_len = ieee80211_hdrlen(hdr->frame_control); + + if ((likely(hdr_len <= DP_MAX_NWIFI_HDR_LEN))) + return true; + + ab->soc_stats.invalid_rbm++; + WARN_ON_ONCE(1); + return false; +} + static int ath11k_dp_rx_process_msdu(struct ath11k *ar, struct sk_buff *msdu, struct sk_buff_head *msdu_list, @@ -2572,6 +2595,11 @@ static int ath11k_dp_rx_process_msdu(struct ath11k *ar, } } + if (unlikely(!ath11k_dp_rx_check_nwifi_hdr_len_valid(ab, rx_desc, msdu))) { + ret = -EINVAL; + goto free_out; + } + ath11k_dp_rx_h_ppdu(ar, rx_desc, rx_status); ath11k_dp_rx_h_mpdu(ar, msdu, rx_desc, rx_status); @@ -3261,6 +3289,12 @@ static int ath11k_dp_rx_h_verify_tkip_mic(struct ath11k *ar, struct ath11k_peer RX_FLAG_IV_STRIPPED | RX_FLAG_DECRYPTED; skb_pull(msdu, hal_rx_desc_sz); + if (unlikely(!ath11k_dp_rx_check_nwifi_hdr_len_valid(ar->ab, rx_desc, + msdu))) { + dev_kfree_skb_any(msdu); + return -EINVAL; + } + ath11k_dp_rx_h_ppdu(ar, rx_desc, rxs); ath11k_dp_rx_h_undecap(ar, msdu, rx_desc, HAL_ENCRYPT_TYPE_TKIP_MIC, rxs, true); @@ -3953,6 +3987,10 @@ static int ath11k_dp_rx_h_null_q_desc(struct ath11k *ar, struct sk_buff *msdu, skb_put(msdu, hal_rx_desc_sz + l3pad_bytes + msdu_len); skb_pull(msdu, hal_rx_desc_sz + l3pad_bytes); } + + if (unlikely(!ath11k_dp_rx_check_nwifi_hdr_len_valid(ar->ab, desc, msdu))) + return -EINVAL; + ath11k_dp_rx_h_ppdu(ar, desc, status); ath11k_dp_rx_h_mpdu(ar, msdu, desc, status); @@ -3997,7 +4035,7 @@ static bool ath11k_dp_rx_h_reo_err(struct ath11k *ar, struct sk_buff *msdu, return drop; } -static void ath11k_dp_rx_h_tkip_mic_err(struct ath11k *ar, struct sk_buff *msdu, +static bool ath11k_dp_rx_h_tkip_mic_err(struct ath11k *ar, struct sk_buff *msdu, struct ieee80211_rx_status *status) { u16 msdu_len; @@ -4005,6 +4043,7 @@ static void ath11k_dp_rx_h_tkip_mic_err(struct ath11k *ar, struct sk_buff *msdu, u8 l3pad_bytes; struct ath11k_skb_rxcb *rxcb = ATH11K_SKB_RXCB(msdu); u32 hal_rx_desc_sz = ar->ab->hw_params.hal_desc_sz; + struct ath11k_base *ab = ar->ab; rxcb->is_first_msdu = ath11k_dp_rx_h_msdu_end_first_msdu(ar->ab, desc); rxcb->is_last_msdu = ath11k_dp_rx_h_msdu_end_last_msdu(ar->ab, desc); @@ -4014,6 +4053,9 @@ static void ath11k_dp_rx_h_tkip_mic_err(struct ath11k *ar, struct sk_buff *msdu, skb_put(msdu, hal_rx_desc_sz + l3pad_bytes + msdu_len); skb_pull(msdu, hal_rx_desc_sz + l3pad_bytes); + if (unlikely(!ath11k_dp_rx_check_nwifi_hdr_len_valid(ab, desc, msdu))) + return true; + ath11k_dp_rx_h_ppdu(ar, desc, status); status->flag |= (RX_FLAG_MMIC_STRIPPED | RX_FLAG_MMIC_ERROR | @@ -4021,19 +4063,21 @@ static void ath11k_dp_rx_h_tkip_mic_err(struct ath11k *ar, struct sk_buff *msdu, ath11k_dp_rx_h_undecap(ar, msdu, desc, HAL_ENCRYPT_TYPE_TKIP_MIC, status, false); + + return false; } static bool ath11k_dp_rx_h_rxdma_err(struct ath11k *ar, struct sk_buff *msdu, struct ieee80211_rx_status *status) { struct ath11k_skb_rxcb *rxcb = ATH11K_SKB_RXCB(msdu); - bool drop = false; + bool drop; ar->ab->soc_stats.rxdma_error[rxcb->err_code]++; switch (rxcb->err_code) { case HAL_REO_ENTR_RING_RXDMA_ECODE_TKIP_MIC_ERR: - ath11k_dp_rx_h_tkip_mic_err(ar, msdu, status); + drop = ath11k_dp_rx_h_tkip_mic_err(ar, msdu, status); break; default: /* TODO: Review other rxdma error code to check if anything is -- 2.34.1 In the WBM error path, while processing TKIP MIC errors, MSDU length is fetched from the hal_rx_desc's msdu_end. This MSDU length is directly passed to skb_put() without validation. In stress test scenarios, the WBM error ring may receive invalid descriptors, which could lead to an invalid MSDU length. To fix this, add a check to drop the skb when the calculated MSDU length is greater than the skb size. This is adapted from the discussion/patch of the ath12k driver [1]. Tested-on: WCN6855 hw2.1 PCI WLAN.HSP.1.1-04685-QCAHSPSWPL_V1_V2_SILICONZ_IOE-1 Link: https://lore.kernel.org/linux-wireless/20250416021903.3178962-1-nithyanantham.paramasivam@oss.qualcomm.com/ # [1] Signed-off-by: Miaoqing Pan --- drivers/net/wireless/ath/ath11k/dp_rx.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c index fbe2061a544d..9c31bb7efcc8 100644 --- a/drivers/net/wireless/ath/ath11k/dp_rx.c +++ b/drivers/net/wireless/ath/ath11k/dp_rx.c @@ -4050,6 +4050,15 @@ static bool ath11k_dp_rx_h_tkip_mic_err(struct ath11k *ar, struct sk_buff *msdu, l3pad_bytes = ath11k_dp_rx_h_msdu_end_l3pad(ar->ab, desc); msdu_len = ath11k_dp_rx_h_msdu_start_msdu_len(ar->ab, desc); + + if (unlikely(hal_rx_desc_sz + l3pad_bytes + msdu_len > DP_RX_BUFFER_SIZE)) { + ath11k_dbg(ab, ATH11K_DBG_DATA, + "invalid msdu len in tkip mic err %u\n", msdu_len); + ath11k_dbg_dump(ab, ATH11K_DBG_DATA, NULL, "", desc, + sizeof(*desc)); + return true; + } + skb_put(msdu, hal_rx_desc_sz + l3pad_bytes + msdu_len); skb_pull(msdu, hal_rx_desc_sz + l3pad_bytes); -- 2.34.1