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 04FD31527AC; Fri, 6 Dec 2024 15:11:24 +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=1733497884; cv=none; b=tQ8Wd6JsWjysUKk18oGFWxQY0KiOwcM35C7vPPWy7kp77rRioqglA6fOJJRhvrLpY1ndY142CBhx9dfX6huIyl+WmcfGKe6QBCqV0fGSIH74M7G0ZObimeI7QKbg4zf8arHED0E+0Bm5l1ZOrz0G2B0xE99lyQxFw5p5pjwoTEE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733497884; c=relaxed/simple; bh=kNLEjfPvQH6A8/s0/SZAHDg5OEpNjq+YMecE9AOQ3FM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=IzSFzqdwBOuSmiG1Fr7eY1TQqdig7fX5dD0yde274XoCeuFGaV9OvY7RVwjFBbQ+wZux6MYJYJY6Q1ta4mYmqQ9cEP8tkXQYCaDP7C9mhA7pXDTybEKjp45IGHAXXS4w7+KqR3KV/8UPC1AfjmVKF/nFRUyb/MworeAuq3Yc+3Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=iCMJg2Mf; 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="iCMJg2Mf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7E2C0C4CEDC; Fri, 6 Dec 2024 15:11:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1733497883; bh=kNLEjfPvQH6A8/s0/SZAHDg5OEpNjq+YMecE9AOQ3FM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iCMJg2Mfj6LYymb7GtW852CysxeHmddgBdWpTDkBufvngts6FxgqQKypi5e9YJjtW d4WstCO1+Dlmpl3H91k8H4smdVMVaCTo2GTTyyxy3DYZzKj3DlB25tc9HpUS+2RNiD d9Fvwym5uLn6jtz04QfNPkFGXqKtfOOUvr9mp9As= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhongqiu Han , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Bjorn Helgaas , Niklas Cassel , Sasha Levin Subject: [PATCH 6.6 380/676] PCI: endpoint: epf-mhi: Avoid NULL dereference if DT lacks mmio Date: Fri, 6 Dec 2024 15:33:19 +0100 Message-ID: <20241206143708.190375200@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241206143653.344873888@linuxfoundation.org> References: <20241206143653.344873888@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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhongqiu Han [ Upstream commit 5089b3d874e9933d9842e90410d3af1520494757 ] If platform_get_resource_byname() fails and returns NULL because DT lacks an 'mmio' property for the MHI endpoint, dereferencing res->start will cause a NULL pointer access. Add a check to prevent it. Fixes: 1bf5f25324f7 ("PCI: endpoint: Add PCI Endpoint function driver for MHI bus") Link: https://lore.kernel.org/r/20241105120735.1240728-1-quic_zhonhan@quicinc.com Signed-off-by: Zhongqiu Han [kwilczynski: error message update per the review feedback] Signed-off-by: Krzysztof Wilczyński [bhelgaas: commit log] Signed-off-by: Bjorn Helgaas Reviewed-by: Niklas Cassel Signed-off-by: Sasha Levin --- drivers/pci/endpoint/functions/pci-epf-mhi.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c index 34e7191f95086..87154992ea11b 100644 --- a/drivers/pci/endpoint/functions/pci-epf-mhi.c +++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c @@ -600,12 +600,18 @@ static int pci_epf_mhi_bind(struct pci_epf *epf) { struct pci_epf_mhi *epf_mhi = epf_get_drvdata(epf); struct pci_epc *epc = epf->epc; + struct device *dev = &epf->dev; struct platform_device *pdev = to_platform_device(epc->dev.parent); struct resource *res; int ret; /* Get MMIO base address from Endpoint controller */ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mmio"); + if (!res) { + dev_err(dev, "Failed to get \"mmio\" resource\n"); + return -ENODEV; + } + epf_mhi->mmio_phys = res->start; epf_mhi->mmio_size = resource_size(res); -- 2.43.0