package/kernel/mac80211/patches/ath/303-ath10k-drop-MPDU-which-has-discard-flag-set-by-firmw.patch

   1 From: Wen Gong <wgong@codeaurora.org>
   2 Date: Tue, 11 May 2021 20:02:55 +0200
   3 Subject: [PATCH] ath10k: drop MPDU which has discard flag set by firmware
   4  for SDIO
   5
   6 When the discard flag is set by the firmware for an MPDU, it should be
   7 dropped. This allows a mitigation for CVE-2020-24588 to be implemented
   8 in the firmware.
   9
  10 Tested-on: QCA6174 hw3.2 SDIO WLAN.RMH.4.4.1-00049
  11
  12 Cc: stable@vger.kernel.org
  13 Signed-off-by: Wen Gong <wgong@codeaurora.org>
  14 Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
  15 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  16 ---
  17
  18 --- a/drivers/net/wireless/ath/ath10k/htt_rx.c
  19 +++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
  20 @@ -2312,6 +2312,11 @@ static bool ath10k_htt_rx_proc_rx_ind_hl
  21         fw_desc = &rx->fw_desc;
  22         rx_desc_len = fw_desc->len;
  23
  24 +       if (fw_desc->u.bits.discard) {
  25 +               ath10k_dbg(ar, ATH10K_DBG_HTT, "htt discard mpdu\n");
  26 +               goto err;
  27 +       }
  28 +
  29         /* I have not yet seen any case where num_mpdu_ranges > 1.
  30          * qcacld does not seem handle that case either, so we introduce the
  31          * same limitiation here as well.
  32 --- a/drivers/net/wireless/ath/ath10k/rx_desc.h
  33 +++ b/drivers/net/wireless/ath/ath10k/rx_desc.h
  34 @@ -1282,7 +1282,19 @@ struct fw_rx_desc_base {
  35  #define FW_RX_DESC_UDP              (1 << 6)
  36
  37  struct fw_rx_desc_hl {
  38 -       u8 info0;
  39 +       union {
  40 +               struct {
  41 +               u8 discard:1,
  42 +                  forward:1,
  43 +                  any_err:1,
  44 +                  dup_err:1,
  45 +                  reserved:1,
  46 +                  inspect:1,
  47 +                  extension:2;
  48 +               } bits;
  49 +               u8 info0;
  50 +       } u;
  51 +
  52         u8 version;
  53         u8 len;
  54         u8 flags;