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 EB849190496; Tue, 10 Sep 2024 10:16:25 +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=1725963386; cv=none; b=W5BJ7G/yKTxKFa7/pvxJGNOzY2ocwkDjwDKKGUKxfYs9RPbIgRYpxwkJoEUZFKWBIAZA82GgCnCt4PliShGYWLdrydPV/Wwy6VxvGzaRDd/RHK2zdeKizhNxBXh0NiJ0dJWK3IOo2zTCIoUMZdmKJ4ZMRgyB6fV98jEvbSwryr8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725963386; c=relaxed/simple; bh=SbM5QXbHwyVJ1VsDbSv6Vwl7uVigReiXGdVQIz13A/w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=pn0XBBHCuFHGlxxQ3qklgpV2mbE5mrDKJ+tKDJI1nLvSALZzA5UEb6RLoWIwzj7UxvMWQM4zfBOaxAZcIRxB9cUhsSwH+OHFjV8MdMkBywNt2RUB1n38rG27O3C7YBvfD0aX1ayyk8UUuCw675gn3/H8Q4zJ2Gy89oretLxexR8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=O12Pv5aZ; 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="O12Pv5aZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6F391C4CEC3; Tue, 10 Sep 2024 10:16:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1725963385; bh=SbM5QXbHwyVJ1VsDbSv6Vwl7uVigReiXGdVQIz13A/w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=O12Pv5aZL1MZ4VLJ6c0Cbtf98Ae8TPEM9WPDemXx6MvMh50G1ilX1jfGOHW+N7PK9 EMvbWWjM+0A5s2q9N7aE/CJqdbGK3rKU4Z1BAmzigd5oFFbqrzFk5PkV8rUiL6Sz30 Xv1pyY7LX6uB4syn735j72L0v43IvA1ewTOD34YU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Bjorn Helgaas , Aleksandr Mishin , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Bjorn Helgaas , Sasha Levin Subject: [PATCH 5.15 040/214] PCI: al: Check IORESOURCE_BUS existence during probe Date: Tue, 10 Sep 2024 11:31:02 +0200 Message-ID: <20240910092600.414330920@linuxfoundation.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910092558.714365667@linuxfoundation.org> References: <20240910092558.714365667@linuxfoundation.org> User-Agent: quilt/0.67 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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Aleksandr Mishin [ Upstream commit a9927c2cac6e9831361e43a14d91277818154e6a ] If IORESOURCE_BUS is not provided in Device Tree it will be fabricated in of_pci_parse_bus_range(), so NULL pointer dereference should not happen here. But that's hard to verify, so check for NULL anyway. Found by Linux Verification Center (linuxtesting.org) with SVACE. Link: https://lore.kernel.org/linux-pci/20240503125705.46055-1-amishin@t-argos.ru Suggested-by: Bjorn Helgaas Signed-off-by: Aleksandr Mishin Signed-off-by: Krzysztof Wilczyński [bhelgaas: commit log] Signed-off-by: Bjorn Helgaas Signed-off-by: Sasha Levin --- drivers/pci/controller/dwc/pcie-al.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-al.c b/drivers/pci/controller/dwc/pcie-al.c index e8afa50129a8..60a0d59a533f 100644 --- a/drivers/pci/controller/dwc/pcie-al.c +++ b/drivers/pci/controller/dwc/pcie-al.c @@ -242,18 +242,24 @@ static struct pci_ops al_child_pci_ops = { .write = pci_generic_config_write, }; -static void al_pcie_config_prepare(struct al_pcie *pcie) +static int al_pcie_config_prepare(struct al_pcie *pcie) { struct al_pcie_target_bus_cfg *target_bus_cfg; struct pcie_port *pp = &pcie->pci->pp; unsigned int ecam_bus_mask; + struct resource_entry *ft; u32 cfg_control_offset; + struct resource *bus; u8 subordinate_bus; u8 secondary_bus; u32 cfg_control; u32 reg; - struct resource *bus = resource_list_first_type(&pp->bridge->windows, IORESOURCE_BUS)->res; + ft = resource_list_first_type(&pp->bridge->windows, IORESOURCE_BUS); + if (!ft) + return -ENODEV; + + bus = ft->res; target_bus_cfg = &pcie->target_bus_cfg; ecam_bus_mask = (pcie->ecam_size >> PCIE_ECAM_BUS_SHIFT) - 1; @@ -287,6 +293,8 @@ static void al_pcie_config_prepare(struct al_pcie *pcie) FIELD_PREP(CFG_CONTROL_SEC_BUS_MASK, secondary_bus); al_pcie_controller_writel(pcie, cfg_control_offset, reg); + + return 0; } static int al_pcie_host_init(struct pcie_port *pp) @@ -305,7 +313,9 @@ static int al_pcie_host_init(struct pcie_port *pp) if (rc) return rc; - al_pcie_config_prepare(pcie); + rc = al_pcie_config_prepare(pcie); + if (rc) + return rc; return 0; } -- 2.43.0