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wifi: rtw89: use u32_encode_bits() to fill MAC quota value

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Coverity reported shift 16 bits could cause sign extension and might get
an unexpected value. Since the input values are predefined and no this
kind of case, original code is safe so far. But, still changing them to
use u32_encode_bits() will be more clear and prevent mistakes in the
future.

The original message of Coverity is:
  Suspicious implicit sign extension: "max_cfg->cma0_dma" with type "u16"
  (16 bits, unsigned) is promoted in "max_cfg->cma0_dma << 16" to type
  "int" (32 bits, signed), then sign-extended to type "unsigned long"
  (64 bits, unsigned).  If "max_cfg->cma0_dma << 16" is greater than
  0x7FFFFFFF, the upper bits of the result will all be 1."

Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1527095 ("Integer handling issues")
Fixes: e3ec7017f6 ("rtw89: add Realtek 802.11ax driver")
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20221108013858.10806-1-pkshih@realtek.com
This commit is contained in:
Ping-Ke Shih 2022-11-08 09:38:58 +08:00 committed by Kalle Valo
parent b8f6efccbb
commit 525c06c81d
1 changed files with 2 additions and 4 deletions
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6
drivers/net/wireless/realtek/rtw89/mac.c
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@ -1649,10 +1649,8 @@ static int dle_mix_cfg(struct rtw89_dev *rtwdev, const struct rtw89_dle_mem *cfg
#define INVALID_QT_WCPU U16_MAX
#define SET_QUOTA_VAL(_min_x, _max_x, _module, _idx) \
do { \
val = ((_min_x) & \
B_AX_ ## _module ## _MIN_SIZE_MASK) | \
(((_max_x) << 16) & \
B_AX_ ## _module ## _MAX_SIZE_MASK); \
val = u32_encode_bits(_min_x, B_AX_ ## _module ## _MIN_SIZE_MASK) | \
u32_encode_bits(_max_x, B_AX_ ## _module ## _MAX_SIZE_MASK); \
rtw89_write32(rtwdev, \
R_AX_ ## _module ## _QTA ## _idx ## _CFG, \
val); \