From: Zong-Zhe Yang Date: Wed, 27 Jul 2022 06:50:03 +0000 (+0800) Subject: wifi: rtw88: phy: fix warning of possible buffer overflow X-Git-Tag: v6.1-rc5~319^2~329^2~51 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=86331c7e0cd819bf0c1d0dcf895e0c90b0aa9a6f;p=platform%2Fkernel%2Flinux-starfive.git wifi: rtw88: phy: fix warning of possible buffer overflow reported by smatch phy.c:854 rtw_phy_linear_2_db() error: buffer overflow 'db_invert_table[i]' 8 <= 8 (assuming for loop doesn't break) However, it seems to be a false alarm because we prevent it originally via if (linear >= db_invert_table[11][7]) return 96; /* maximum 96 dB */ Still, we adjust the code to be more readable and avoid smatch warning. Signed-off-by: Zong-Zhe Yang Signed-off-by: Ping-Ke Shih Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20220727065003.28340-5-pkshih@realtek.com --- diff --git a/drivers/net/wireless/realtek/rtw88/phy.c b/drivers/net/wireless/realtek/rtw88/phy.c index 8982e0c..da1efec 100644 --- a/drivers/net/wireless/realtek/rtw88/phy.c +++ b/drivers/net/wireless/realtek/rtw88/phy.c @@ -816,23 +816,18 @@ static u8 rtw_phy_linear_2_db(u64 linear) u8 j; u32 dB; - if (linear >= db_invert_table[11][7]) - return 96; /* maximum 96 dB */ - for (i = 0; i < 12; i++) { - if (i <= 2 && (linear << FRAC_BITS) <= db_invert_table[i][7]) - break; - else if (i > 2 && linear <= db_invert_table[i][7]) - break; + for (j = 0; j < 8; j++) { + if (i <= 2 && (linear << FRAC_BITS) <= db_invert_table[i][j]) + goto cnt; + else if (i > 2 && linear <= db_invert_table[i][j]) + goto cnt; + } } - for (j = 0; j < 8; j++) { - if (i <= 2 && (linear << FRAC_BITS) <= db_invert_table[i][j]) - break; - else if (i > 2 && linear <= db_invert_table[i][j]) - break; - } + return 96; /* maximum 96 dB */ +cnt: if (j == 0 && i == 0) goto end;