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 0619E364 for ; Mon, 3 Apr 2023 05:17:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0495FC433D2; Mon, 3 Apr 2023 05:17:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1680499040; bh=g2TSS6m0UMtjThk7tJNAadrmxBfJBuYpYI2CML4irS0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=j/QRGMOcuaDDa2RhAQeD9MHMeuqXNqS23ZE/TWoO2ArLqF+WKfeWlC3RzppXrS9fo sm8AFyrw7xyv7HCHp8+vdvZ2J+Dx8P/7XNYrS9wa/otAv8huW2YSVQw88p0A1tOgt7 U1uYv35/CqW77ve5hwCzb/0Gt/5sfqXQ0/2qBe1nvTYyJ+sshEcyMHl3IkOFe5/gbd lagS1wWq/xYZvi1B2Xl8bc/QfdR+nYTcVjkitsLCqRPDm8W0kQyXmYqGksa4OvF5Ir EoPJZ+U9DD+4n+h54TzHSVSoqMpo8k+SaYAA1GMiNSlJd2ZrpVh9q3KIqzRrnZb0JP p2AQ0PXp5lqJw== Date: Mon, 3 Apr 2023 10:47:15 +0530 From: Manivannan Sadhasivam To: Jeffrey Hugo Cc: mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v2] bus: mhi: host: Range check CHDBOFF and ERDBOFF Message-ID: <20230403051715.GB4627@thinkpad> References: <1679674384-27209-1-git-send-email-quic_jhugo@quicinc.com> Precedence: bulk X-Mailing-List: mhi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1679674384-27209-1-git-send-email-quic_jhugo@quicinc.com> On Fri, Mar 24, 2023 at 10:13:04AM -0600, Jeffrey Hugo wrote: > If the value read from the CHDBOFF and ERDBOFF registers is outside the > range of the MHI register space then an invalid address might be computed > which later causes a kernel panic. Range check the read value to prevent > a crash due to bad data from the device. > > Fixes: 6cd330ae76ff ("bus: mhi: core: Add support for ringing channel/event ring doorbells") > Cc: stable@vger.kernel.org > Signed-off-by: Jeffrey Hugo Applied to mhi-next! - Mani > Reviewed-by: Pranjal Ramajor Asha Kanojiya > --- > > v2: > -CC stable > -Use ERANGE for the error code > > drivers/bus/mhi/host/init.c | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c > index 3d779ee..b46a082 100644 > --- a/drivers/bus/mhi/host/init.c > +++ b/drivers/bus/mhi/host/init.c > @@ -516,6 +516,12 @@ int mhi_init_mmio(struct mhi_controller *mhi_cntrl) > return -EIO; > } > > + if (val >= mhi_cntrl->reg_len - (8 * MHI_DEV_WAKE_DB)) { > + dev_err(dev, "CHDB offset: 0x%x is out of range: 0x%zx\n", > + val, mhi_cntrl->reg_len - (8 * MHI_DEV_WAKE_DB)); > + return -ERANGE; > + } > + > /* Setup wake db */ > mhi_cntrl->wake_db = base + val + (8 * MHI_DEV_WAKE_DB); > mhi_cntrl->wake_set = false; > @@ -532,6 +538,12 @@ int mhi_init_mmio(struct mhi_controller *mhi_cntrl) > return -EIO; > } > > + if (val >= mhi_cntrl->reg_len - (8 * mhi_cntrl->total_ev_rings)) { > + dev_err(dev, "ERDB offset: 0x%x is out of range: 0x%zx\n", > + val, mhi_cntrl->reg_len - (8 * mhi_cntrl->total_ev_rings)); > + return -ERANGE; > + } > + > /* Setup event db address for each ev_ring */ > mhi_event = mhi_cntrl->mhi_event; > for (i = 0; i < mhi_cntrl->total_ev_rings; i++, val += 8, mhi_event++) { > -- > 2.7.4 > -- மணிவண்ணன் சதாசிவம்