linux-kernel - [PATCH v2 09/10] PCI: keystone: Exit ks_pcie_probe() for the default switch-case of "mode"

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250912122356.3326888-10-s-vadapalli@ti.com>
Date: Fri, 12 Sep 2025 17:46:20 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: <lpieralisi@...nel.org>, <kwilczynski@...nel.org>, <mani@...nel.org>,
        <robh@...nel.org>, <bhelgaas@...gle.com>, <jingoohan1@...il.com>,
        <christian.bruel@...s.st.com>, <qiang.yu@....qualcomm.com>,
        <mayank.rana@....qualcomm.com>, <thippeswamy.havalige@....com>,
        <shradha.t@...sung.com>, <quic_schintav@...cinc.com>,
        <inochiama@...il.com>, <cassel@...nel.org>, <kishon@...nel.org>,
        <sergio.paracuellos@...il.com>, <18255117159@....com>,
        <rongqianfeng@...o.com>
CC: <jirislaby@...nel.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <srk@...com>, <s-vadapalli@...com>
Subject: [PATCH v2 09/10] PCI: keystone: Exit ks_pcie_probe() for the default switch-case of "mode"

In ks_pcie_probe(), the switch-case for the "mode" is used to configure
the PCIe Controller for either Root-Complex or Endpoint mode of operation.
Prior to the switch-case statement for "mode" an invalid mode will result
in probe failure only if "dw_pcie_ver_is_ge(pci, 480A)" is true, which
is the case for the AM654 platform. On the other hand, when that is not
the case, "ks_pcie_set_mode()" will be invoked, which does not validate
the mode. As a result, it is possible for the switch-case statement for
"mode" to receive an invalid mode. Currently, an error message is displayed
in the "default" case where "mode" is neither "DW_PCIE_RC_TYPE" nor
"DW_PCIE_EP_TYPE", but the probe succeeds. However, since the configuration
required for Root-Complex and Endpoint mode have not been performed, the
Controller is not operational.

Fix this by exiting "ks_pcie_probe()" with the return value of "-EINVAL"
in addition to displaying the existing error message.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---

v1: https://lore.kernel.org/r/20250903124505.365913-11-s-vadapalli@ti.com/
No changes since v1.

 drivers/pci/controller/dwc/pci-keystone.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 2da9feaaf9ee..e85942b4f6be 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -1414,6 +1414,8 @@ static int ks_pcie_probe(struct platform_device *pdev)
 		break;
 	default:
 		dev_err(dev, "INVALID device type %d\n", mode);
+		ret = -EINVAL;
+		goto err_get_sync;
 	}

 	ks_pcie_enable_error_irq(ks_pcie);
-- 
2.43.0