package/kernel/mac80211/patches/ath11k/0053-wifi-ath11k-fix-writing-to-unintended-memory-region.patch

   1 From 756a7f90878f0866fd2fe167ef37e90b47326b96 Mon Sep 17 00:00:00 2001
   2 From: P Praneesh <quic_ppranees@quicinc.com>
   3 Date: Fri, 24 Mar 2023 16:57:01 +0200
   4 Subject: [PATCH] wifi: ath11k: fix writing to unintended memory region
   5
   6 While initializing spectral, the magic value is getting written to the
   7 invalid memory address leading to random boot-up crash. This occurs
   8 due to the incorrect index increment in ath11k_dbring_fill_magic_value
   9 function. Fix it by replacing the existing logic with memset32 to ensure
  10 there is no invalid memory access.
  11
  12 Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.4.0.1-01838-QCAHKSWPL_SILICONZ-1
  13
  14 Fixes: d3d358efc553 ("ath11k: add spectral/CFR buffer validation support")
  15 Signed-off-by: P Praneesh <quic_ppranees@quicinc.com>
  16 Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
  17 Link: https://lore.kernel.org/r/20230321052900.16895-1-quic_ppranees@quicinc.com
  18 ---
  19  drivers/net/wireless/ath/ath11k/dbring.c | 12 ++++++------
  20  1 file changed, 6 insertions(+), 6 deletions(-)
  21
  22 --- a/drivers/net/wireless/ath/ath11k/dbring.c
  23 +++ b/drivers/net/wireless/ath/ath11k/dbring.c
  24 @@ -26,13 +26,13 @@ int ath11k_dbring_validate_buffer(struct
  25  static void ath11k_dbring_fill_magic_value(struct ath11k *ar,
  26                                            void *buffer, u32 size)
  27  {
  28 -       u32 *temp;
  29 -       int idx;
  30 +       /* memset32 function fills buffer payload with the ATH11K_DB_MAGIC_VALUE
  31 +        * and the variable size is expected to be the number of u32 values
  32 +        * to be stored, not the number of bytes.
  33 +        */
  34 +       size = size / sizeof(u32);
  35
  36 -       size = size >> 2;
  37 -
  38 -       for (idx = 0, temp = buffer; idx < size; idx++, temp++)
  39 -               *temp++ = ATH11K_DB_MAGIC_VALUE;
  40 +       memset32(buffer, ATH11K_DB_MAGIC_VALUE, size);
  41  }
  42
  43  static int ath11k_dbring_bufs_replenish(struct ath11k *ar,