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X-OriginatorOrg: duagon.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Mar 2023 10:50:12.7881 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cd882885-0997-4dbb-f92e-08db310c8a0e 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: VE1EUR01FT045.eop-EUR01.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV0P278MB0161 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org mcb-pci 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-pci.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-) diff --git a/drivers/mcb/mcb-pci.c b/drivers/mcb/mcb-pci.c index dc88232d9af8..53d9202ff9a7 100644 --- a/drivers/mcb/mcb-pci.c +++ b/drivers/mcb/mcb-pci.c @@ -31,7 +31,7 @@ static int mcb_pci_probe(struct pci_dev *pdev, const stru= ct pci_device_id *id) { struct resource *res; struct priv *priv; - int ret; + int ret, table_size; unsigned long flags; =20 priv =3D devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL); @@ -90,7 +90,30 @@ static int mcb_pci_probe(struct pci_dev *pdev, const str= uct pci_device_id *id) if (ret < 0) 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->mapbase, CHAM_HEADER_SIZE); + + /* Then, allocate it again with the actual chameleon table size */ + res =3D devm_request_mem_region(&pdev->dev, priv->mapbase, + 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->mapbase, table_size); + if (!priv->base) { + dev_err(&pdev->dev, "Cannot ioremap\n"); + ret =3D -ENOMEM; + goto out_mcb_bus; + } + } =20 mcb_bus_add_devices(priv->bus); =20 --=20 2.34.1