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 D7F7F1F130D; Wed, 6 Nov 2024 12:52:45 +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=1730897565; cv=none; b=L9Py5zvtB4K1oweMzm9wyP+X5uAhLzG3quD0vGf6WiUWqXzsJH1SoWFxz/aGOe1oRcHyqk/IeCG2flYrEi/WOXH1R5SDhRRZcY+I5oL3+vqGLYzuMhkgwmJXma557/CF4IjOMXZimol/mhbZ3Fc2obd1y2CSZuVx+aYIr24p1Ds= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730897565; c=relaxed/simple; bh=jzIZY/ekHa4AL0CiclzgVWZTK59gS0qBbp896rp2CjE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rjSEj09kWmwJscaXstX+DZUeHqLZbqFZ3q90NHXZVEYrZxrhK5vCPzEs6+Yob0dMTKhUODBtaltHvtubqaZv6qk3Thn1KVuGchkzR4DusycOaCNa3H/+P8EmBxbwgd7EQKg+qHDGr+SolpyC67f8j11kQ8p7Gfzn1cutgVVd3xU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=VNSLl5Hb; 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="VNSLl5Hb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5DDD8C4CECD; Wed, 6 Nov 2024 12:52:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1730897565; bh=jzIZY/ekHa4AL0CiclzgVWZTK59gS0qBbp896rp2CjE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VNSLl5HbgtgbM+GNnWX4lknHrGZ4uDaFrTd1nX0YqYcVtBFzei9MTvEXt98uBDQ2W eC6jq3CMzNXwPOmqc/IH618dZJgbOyoR8VSek4+NoxAxUxJZmCfomsyte7fvISqmC3 /hNZ13buQcp6kggJlnFDbRdJKm559ZEr+j0l5iU0= 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 6.6 096/151] staging: iio: frequency: ad9832: fix division by zero in ad9832_calc_freqreg() Date: Wed, 6 Nov 2024 13:04:44 +0100 Message-ID: <20241106120311.514691528@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241106120308.841299741@linuxfoundation.org> References: <20241106120308.841299741@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-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) |