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 9202AC433F5 for ; Sun, 9 Oct 2022 22:44:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232505AbiJIWov (ORCPT ); Sun, 9 Oct 2022 18:44:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36830 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233182AbiJIWn5 (ORCPT ); Sun, 9 Oct 2022 18:43:57 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3E0A44333C; Sun, 9 Oct 2022 15:22:51 -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 BD86AB80DDC; Sun, 9 Oct 2022 22:21:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 27EF0C433C1; Sun, 9 Oct 2022 22:21:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1665354092; bh=tsIbGN8bM3wlp2iJRSm//9ie7hNncGa0aREaO2RU/As=; h=From:To:Cc:Subject:Date:From; b=HfJKReIdA9w1eKeQGKbWoj0IZuWJ5XPlzV9fJLfDIgLSvpeZmRy7+RiOF9HWby3+9 L7+akKvXpvmlXY1ROFQAovnKUF1M2QtfRe6FHkix2CUSNiFedp3Wfk1mH62oXFW+Vw PUIoaFfxnKzaE8MABJiYB5lMtX9W267ulvhwtmgyM/GE35t+XrS24Rys/86sMB91We bnpioGf+nFStW62K9EBX1rvX1p/fKmWkwDX+ozRrgkr0hcIK5VhBEqv3uKmFwwtjy1 Vm3iAFEqZzKuPLeot3JG7oLGbG/KUXrFEL8BDzhRWpzRlmVAknK44TlQb5r8wJiB+d fUElXA3i+ipaw== 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 5.10 01/34] wifi: rtw88: phy: fix warning of possible buffer overflow Date: Sun, 9 Oct 2022 18:20:55 -0400 Message-Id: <20221009222129.1218277-1-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 af8b703d11d4..0fc5a893c395 100644 --- a/drivers/net/wireless/realtek/rtw88/phy.c +++ b/drivers/net/wireless/realtek/rtw88/phy.c @@ -604,23 +604,18 @@ 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