From: Brian Norris briannorris@chromium.org
[ Upstream commit 22b726cbdd09d9891ede8aa122a950d2d0ae5e09 ]
I'm not a standards expert, but this really looks to be undefined behavior, when chip->dig_cck may be NULL. (And, we're trying to do a NULL check a few lines down, because some chip variants will use NULL.)
Fixes: fc637a860a82 ("rtw88: 8723d: Set IG register for CCK rate") Signed-off-by: Brian Norris briannorris@chromium.org Acked-by: Yan-Hsuan Chuang yhchuang@realtek.com Signed-off-by: Kalle Valo kvalo@codeaurora.org Link: https://lore.kernel.org/r/20200821211716.1631556-1-briannorris@chromium.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/realtek/rtw88/phy.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtw88/phy.c b/drivers/net/wireless/realtek/rtw88/phy.c index 8d93f31597469..9687b376d221b 100644 --- a/drivers/net/wireless/realtek/rtw88/phy.c +++ b/drivers/net/wireless/realtek/rtw88/phy.c @@ -147,12 +147,13 @@ void rtw_phy_dig_write(struct rtw_dev *rtwdev, u8 igi) { struct rtw_chip_info *chip = rtwdev->chip; struct rtw_hal *hal = &rtwdev->hal; - const struct rtw_hw_reg *dig_cck = &chip->dig_cck[0]; u32 addr, mask; u8 path;
- if (dig_cck) + if (chip->dig_cck) { + const struct rtw_hw_reg *dig_cck = &chip->dig_cck[0]; rtw_write32_mask(rtwdev, dig_cck->addr, dig_cck->mask, igi >> 1); + }
for (path = 0; path < hal->rf_path_num; path++) { addr = chip->dig[path].addr;