From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6D98B1CB310; Wed, 6 Nov 2024 13:17:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730899079; cv=none; b=KyNFvrMsyqfQxYAlHdkwWQDOucP5X3+E4m40BJm/N9yfKaGI5ObScmrVpGinAoP3hwKLvbFtCwNb4xQMf7z3UqhiPqDRI6fpcwENCnF1IGYh5bOstO5F1WnOEqfpSOXaLbKW6vlKUV56VK7UnQWzkPOO0IRmF6U1lSAmuc7Pjjk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730899079; c=relaxed/simple; bh=6BNsEMHtn31c6hk75qKqvifRY0Cw7Fj2fu/7D+WiskE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bSz05RAjkKfNrrYaQbSgJHWNJiDR/MTltf+2sDmD0wh9W5rwcqsQzVl1kij1LdMTyvMKbdPwbi8iQNGb6YfcrEFSUMp+V2Kbit+WwdtwWlfP3WRpm2PMu8utZs8+03j+Nocj+BEYpRv+oe4Jq7+UTNXKThVjkLlMuoqXUDsAhsc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Bx6SEynL; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Bx6SEynL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EAE22C4CECD; Wed, 6 Nov 2024 13:17:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1730899079; bh=6BNsEMHtn31c6hk75qKqvifRY0Cw7Fj2fu/7D+WiskE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Bx6SEynLpZpEU3b1na9vj4mgcciuGIJJBMicrCq2e8/UBZhF6TONZzDDlvfJaZ2sj dTyO9qPVc5jNoRqw+9jVkhFLGESSeo88MKwdUy0tW9OqfrfkbNOTbgHR7FSY3awmuK fOOKvZ3jFMSjmTAigQDv4HF/DVx7yWcrTOBkaTw4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zicheng Qu , Nuno Sa , Dan Carpenter , Jonathan Cameron Subject: [PATCH 5.4 453/462] staging: iio: frequency: ad9832: fix division by zero in ad9832_calc_freqreg() Date: Wed, 6 Nov 2024 13:05:46 +0100 Message-ID: <20241106120342.694752094@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241106120331.497003148@linuxfoundation.org> References: <20241106120331.497003148@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zicheng Qu commit 6bd301819f8f69331a55ae2336c8b111fc933f3d upstream. In the ad9832_write_frequency() function, clk_get_rate() might return 0. This can lead to a division by zero when calling ad9832_calc_freqreg(). The check if (fout > (clk_get_rate(st->mclk) / 2)) does not protect against the case when fout is 0. The ad9832_write_frequency() function is called from ad9832_write(), and fout is derived from a text buffer, which can contain any value. Link: https://lore.kernel.org/all/2024100904-CVE-2024-47663-9bdc@gregkh/ Fixes: ea707584bac1 ("Staging: IIO: DDS: AD9832 / AD9835 driver") Cc: stable@vger.kernel.org Signed-off-by: Zicheng Qu Reviewed-by: Nuno Sa Reviewed-by: Dan Carpenter Link: https://patch.msgid.link/20241022134354.574614-1-quzicheng@huawei.com Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/frequency/ad9832.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) --- a/drivers/staging/iio/frequency/ad9832.c +++ b/drivers/staging/iio/frequency/ad9832.c @@ -129,12 +129,15 @@ static unsigned long ad9832_calc_freqreg static int ad9832_write_frequency(struct ad9832_state *st, unsigned int addr, unsigned long fout) { + unsigned long clk_freq; unsigned long regval; - if (fout > (clk_get_rate(st->mclk) / 2)) + clk_freq = clk_get_rate(st->mclk); + + if (!clk_freq || fout > (clk_freq / 2)) return -EINVAL; - regval = ad9832_calc_freqreg(clk_get_rate(st->mclk), fout); + regval = ad9832_calc_freqreg(clk_freq, fout); st->freq_data[0] = cpu_to_be16((AD9832_CMD_FRE8BITSW << CMD_SHIFT) | (addr << ADD_SHIFT) |