From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 498C9C433FE for ; Sun, 9 Oct 2022 22:50:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233551AbiJIWuV (ORCPT ); Sun, 9 Oct 2022 18:50:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233475AbiJIWtL (ORCPT ); Sun, 9 Oct 2022 18:49:11 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7BE50205D7; Sun, 9 Oct 2022 15:25:36 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 87F07B80DCE; Sun, 9 Oct 2022 22:23:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E9D54C433C1; Sun, 9 Oct 2022 22:23:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1665354187; bh=j3yQ7o0hPyCMBF62obUgLRMZOFQxxyZ8YaSbdvVdaLQ=; h=From:To:Cc:Subject:Date:From; b=dr+CxJNcAmc8IhXT+4iMzGsEeFYn0bMQM/CBjRxIolx16Q9yDgLAN16JdP7YpsXhK NOJ2gEeIVOO5x6KdQ1MaH3LuFLwQXJkhyM6CSFVaObsxvfr9eVaPnIGjXVcbmw8jKq jol0tbh4k+XfAldaLM4mbAPj2tJOxkRVQMEVHXg406to0E5jajZAr0R0EKE8pOIBvI O1yDwcQSj0Eh4vZK/UI7AOV0dQmfrfrEsvygVWrF7Mb1yNIKc2xgzumSJ3d4nanCLj J2a59Tczra0EYyTG5IiKNC38VlLKI3SDteX9+nlFd8QZJCpS6UUKgFoIsAm8Cmn52C wn1j3P9FCdc8A== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zong-Zhe Yang , Ping-Ke Shih , Kalle Valo , Sasha Levin , tony0620emma@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 01/29] wifi: rtw88: phy: fix warning of possible buffer overflow Date: Sun, 9 Oct 2022 18:22:36 -0400 Message-Id: <20221009222304.1218873-1-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Zong-Zhe Yang [ Upstream commit 86331c7e0cd819bf0c1d0dcf895e0c90b0aa9a6f ] 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 Signed-off-by: Sasha Levin --- drivers/net/wireless/realtek/rtw88/phy.c | 21 ++++++++------------- 1 file changed, 8 insertions(+), 13 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw88/phy.c b/drivers/net/wireless/realtek/rtw88/phy.c index 02da69e9dfe7..2227bbd14644 100644 --- a/drivers/net/wireless/realtek/rtw88/phy.c +++ b/drivers/net/wireless/realtek/rtw88/phy.c @@ -586,23 +586,18 @@ 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; -- 2.35.1