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 AC023190072; Tue, 10 Sep 2024 10:36:55 +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=1725964615; cv=none; b=qGGhZYst6kilXfGwBo8Ks1j0mwFArrLjja4eFz7F/aBOnQa6DNgQkl54oepNqQFjjN1LL1N9Rl79DFrTFxuz2EnG1UoEywHRlpttzaPlvINecrTtdea0fn3eEiaAtBgE52sNnaZEZ3XF+uuguwiL79rR6dhcads2PMBJHNYumIM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725964615; c=relaxed/simple; bh=x4hu3FWnrFDJSFLfYLJ5AF3+KAnfePZDTv7+vtsC5nM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lfck+wxh7clMztGBuyUvc+/MXWZ7OCWVj96zyWRnBoHOgIa1N2rZBFPWd50j1mtNM8UMyccirFBNFfEDQNmLToydrFALaeYpOYxYXtto7cCabWU6OV9BJ0UOxWH2Nn3y5+iC/lS+tmYpTxfnoeEsn4xzpPRMuphOTJHY0Jgod/c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=T6myK+4u; 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="T6myK+4u" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E15E9C4CEC6; Tue, 10 Sep 2024 10:36:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1725964615; bh=x4hu3FWnrFDJSFLfYLJ5AF3+KAnfePZDTv7+vtsC5nM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=T6myK+4urpccgdI29P09XviRTzjZrmYOUn+xMZfB8Vzs5/gHLLfa4a4u4nqahZzTR xG4cOtkThgd4imFlplXVG2K8xDbbJU62WeJe95nEvuelXBqKWrxXq6LCDzkPcoS4xE H5byEZTLHnv/h+8JkuxHD6H4WX3xd5urUH4TeRIQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dan Carpenter , Aleksandr Mishin , Stable@vger.kernel.org, Jonathan Cameron Subject: [PATCH 6.6 205/269] staging: iio: frequency: ad9834: Validate frequency parameter value Date: Tue, 10 Sep 2024 11:33:12 +0200 Message-ID: <20240910092615.366668309@linuxfoundation.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910092608.225137854@linuxfoundation.org> References: <20240910092608.225137854@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: Aleksandr Mishin commit b48aa991758999d4e8f9296c5bbe388f293ef465 upstream. In ad9834_write_frequency() clk_get_rate() can return 0. In such case ad9834_calc_freqreg() call will lead to division by zero. Checking 'if (fout > (clk_freq / 2))' doesn't protect in case of 'fout' is 0. ad9834_write_frequency() is called from ad9834_write(), where fout is taken from text buffer, which can contain any value. Modify parameters checking. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 12b9d5bf76bf ("Staging: IIO: DDS: AD9833 / AD9834 driver") Suggested-by: Dan Carpenter Signed-off-by: Aleksandr Mishin Reviewed-by: Dan Carpenter Link: https://patch.msgid.link/20240703154506.25584-1-amishin@t-argos.ru Cc: Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/frequency/ad9834.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/staging/iio/frequency/ad9834.c +++ b/drivers/staging/iio/frequency/ad9834.c @@ -114,7 +114,7 @@ static int ad9834_write_frequency(struct clk_freq = clk_get_rate(st->mclk); - if (fout > (clk_freq / 2)) + if (!clk_freq || fout > (clk_freq / 2)) return -EINVAL; regval = ad9834_calc_freqreg(clk_freq, fout);