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X-OriginatorOrg: duagon.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Mar 2023 10:50:13.1038 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 44677f31-4f0f-403b-c36f-08db310c8a3c X-MS-Exchange-CrossTenant-Id: e5e7e96e-8a28-45d6-9093-a40dd5b51a57 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=e5e7e96e-8a28-45d6-9093-a40dd5b51a57;Ip=[20.79.220.33];Helo=[de1-emailsignatures-cloud.codetwo.com] X-MS-Exchange-CrossTenant-AuthSource: VE1EUR01FT047.eop-EUR01.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: ZR0P278MB1122 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org mcb-lpc requests a fixed-size memory region to parse the chameleon table, however, if the chameleon table is smaller that the allocated region, it could overlap with the IP Cores' memory regions. After parsing the chameleon table, drop/reallocate the memory region with the actual chameleon table size. Co-developed-by: Jorge Sanjuan Garcia Signed-off-by: Jorge Sanjuan Garcia Signed-off-by: Javier Rodriguez --- drivers/mcb/mcb-lpc.c | 35 +++++++++++++++++++++++++++++++---- 1 file changed, 31 insertions(+), 4 deletions(-) diff --git a/drivers/mcb/mcb-lpc.c b/drivers/mcb/mcb-lpc.c index 53decd89876e..a851e0236464 100644 --- a/drivers/mcb/mcb-lpc.c +++ b/drivers/mcb/mcb-lpc.c @@ -23,7 +23,7 @@ static int mcb_lpc_probe(struct platform_device *pdev) { struct resource *res; struct priv *priv; - int ret =3D 0; + int ret =3D 0, table_size; =20 priv =3D devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) @@ -58,16 +58,43 @@ static int mcb_lpc_probe(struct platform_device *pdev) =20 ret =3D chameleon_parse_cells(priv->bus, priv->mem->start, priv->base); if (ret < 0) { - mcb_release_bus(priv->bus); - return ret; + goto out_mcb_bus; } =20 - dev_dbg(&pdev->dev, "Found %d cells\n", ret); + table_size =3D ret; + + if (table_size < CHAM_HEADER_SIZE) { + /* Release the previous resources */ + devm_iounmap(&pdev->dev, priv->base); + devm_release_mem_region(&pdev->dev, priv->mem->start, resource_size(priv= ->mem)); + + /* Then, allocate it again with the actual chameleon table size */ + res =3D devm_request_mem_region(&pdev->dev, priv->mem->start, + table_size, + KBUILD_MODNAME); + if (!res) { + dev_err(&pdev->dev, "Failed to request PCI memory\n"); + ret =3D -EBUSY; + goto out_mcb_bus; + } + + priv->base =3D devm_ioremap(&pdev->dev, priv->mem->start, table_size); + if (!priv->base) { + dev_err(&pdev->dev, "Cannot ioremap\n"); + ret =3D -ENOMEM; + goto out_mcb_bus; + } + + platform_set_drvdata(pdev, priv); + } =20 mcb_bus_add_devices(priv->bus); =20 return 0; =20 +out_mcb_bus: + mcb_release_bus(priv->bus); + return ret; } =20 static int mcb_lpc_remove(struct platform_device *pdev) --=20 2.34.1