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 7A41420CCCA; Tue, 26 Aug 2025 13:38:34 +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=1756215514; cv=none; b=YeMuZ89oAE6cLCTg4lHTHq8POV/1UCQZAYFjxFcwuuwZUj983gume+FEtzBUwAhUnqbdmKM98nwjuhPQIvKqGXikUT4w7uQLqTitQgbn6txbh6rdq8gcoP0ElIUJ1hPVjJD4JcPo/qLhHo5Pj/J04pGjtfCVBkHSJb4SiomYJkE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756215514; c=relaxed/simple; bh=BoCeJ0g+RDTYRfX2c+7gwgAEnJu7xgSCY45Zflt4OgQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=k2P6fdeUMhqd4yyMiqPH7LOEOamN3FO9Iu0+qU10iNLdVLD8rSqf3Am1FFoOUk0tPi+8RxMDRgGBXHgK23wGL+546MnF1GaIuGoD/tc7bnC2oJLNjADHzUVse18eJYLI4aSOu+IQ6EhNd7DgMJWVmM4H3eTYXOKRmb3uMfi0RCI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=g0nEBL2/; 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="g0nEBL2/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 10192C4CEF1; Tue, 26 Aug 2025 13:38:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756215514; bh=BoCeJ0g+RDTYRfX2c+7gwgAEnJu7xgSCY45Zflt4OgQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g0nEBL2/2QvoZ+aIj/hzqeXjKd55Sqx+iqGzuU9EX1qmuwxGiCZ81J/LwzHWpmdIe VJ2MCHalSF6HF/8jNpNC08P9pbsY0mLJ14zhjImXBp7s7/fL5oUTDGQlwf21QVkTQV VimoMXvamjFieCEtPBQRNLcwbRgW2ksb2TZI0XmQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+c52293513298e0fd9a94@syzkaller.appspotmail.com, "Enju, Kohei" , Ian Abbott Subject: [PATCH 5.15 031/644] comedi: das16m1: Fix bit shift out of bounds Date: Tue, 26 Aug 2025 13:02:02 +0200 Message-ID: <20250826110947.280239191@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250826110946.507083938@linuxfoundation.org> References: <20250826110946.507083938@linuxfoundation.org> User-Agent: quilt/0.68 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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ian Abbott commit ed93c6f68a3be06e4e0c331c6e751f462dee3932 upstream. When checking for a supported IRQ number, the following test is used: /* only irqs 2, 3, 4, 5, 6, 7, 10, 11, 12, 14, and 15 are valid */ if ((1 << it->options[1]) & 0xdcfc) { However, `it->options[i]` is an unchecked `int` value from userspace, so the shift amount could be negative or out of bounds. Fix the test by requiring `it->options[1]` to be within bounds before proceeding with the original test. Reported-by: syzbot+c52293513298e0fd9a94@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=c52293513298e0fd9a94 Fixes: 729988507680 ("staging: comedi: das16m1: tidy up the irq support in das16m1_attach()") Tested-by: syzbot+c52293513298e0fd9a94@syzkaller.appspotmail.com Suggested-by: "Enju, Kohei" Cc: stable@vger.kernel.org # 5.13+ Signed-off-by: Ian Abbott Link: https://lore.kernel.org/r/20250707130908.70758-1-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman --- drivers/comedi/drivers/das16m1.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/comedi/drivers/das16m1.c +++ b/drivers/comedi/drivers/das16m1.c @@ -523,7 +523,8 @@ static int das16m1_attach(struct comedi_ devpriv->extra_iobase = dev->iobase + DAS16M1_8255_IOBASE; /* only irqs 2, 3, 4, 5, 6, 7, 10, 11, 12, 14, and 15 are valid */ - if ((1 << it->options[1]) & 0xdcfc) { + if (it->options[1] >= 2 && it->options[1] <= 15 && + (1 << it->options[1]) & 0xdcfc) { ret = request_irq(it->options[1], das16m1_interrupt, 0, dev->board_name, dev); if (ret == 0)