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wifi: rtw89: correct base HT rate mask for firmware

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Coverity reported that u8 rx_mask << 24 will become signed 32 bits, which
casting to unsigned 64 bits will do sign extension. For example,
putting 0x80000000 (signed 32 bits) to a u64 variable will become
0xFFFFFFFF_80000000.

The real case we meet is:
  rx_mask[0...3] = ff ff 00 00
  ra_mask = 0xffffffff_ff0ff000

After this fix:
  rx_mask[0...3] = ff ff 00 00
  ra_mask = 0x00000000_ff0ff000

Fortunately driver does bitwise-AND with incorrect ra_mask and supported
rates (1ss and 2ss rate only) afterward, so the final rate mask of
original code is still correct.

Addresses-Coverity-ID: 1504762 ("Unintended sign extension")

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20240809072012.84152-5-pkshih@realtek.com
This commit is contained in:
Ping-Ke Shih
2024-08-09 15:20:10 +08:00
parent 56310ddb50
commit 45742881f9
1 changed files with 2 additions and 2 deletions
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4
drivers/net/wireless/realtek/rtw89/phy.c
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@@ -356,8 +356,8 @@ static void rtw89_phy_ra_sta_update(struct rtw89_dev *rtwdev,
csi_mode = RTW89_RA_RPT_MODE_HT;
ra_mask |= ((u64)sta->deflink.ht_cap.mcs.rx_mask[3] << 48) |
((u64)sta->deflink.ht_cap.mcs.rx_mask[2] << 36) |
(sta->deflink.ht_cap.mcs.rx_mask[1] << 24) |
(sta->deflink.ht_cap.mcs.rx_mask[0] << 12);
((u64)sta->deflink.ht_cap.mcs.rx_mask[1] << 24) |
((u64)sta->deflink.ht_cap.mcs.rx_mask[0] << 12);
high_rate_masks = rtw89_ra_mask_ht_rates;
if (sta->deflink.ht_cap.cap & IEEE80211_HT_CAP_RX_STBC)
stbc_en = 1;