[bug report] crypto/ccp: Implement SEV-TIO PCIe IDE (phase1)

[bug report] crypto/ccp: Implement SEV-TIO PCIe IDE (phase1)

[Dan Carpenter]

Hello Alexey Kardashevskiy,

Commit 3532f6154971 ("crypto/ccp: Implement SEV-TIO PCIe IDE
(phase1)") from Nov 21, 2025 (linux-next), leads to the following
Smatch static checker warning:

	drivers/crypto/ccp/sev-dev-tsm.c:266 dsm_create()
	error: we previously assumed 'pdev->bus' could be null (see line 264)

drivers/crypto/ccp/sev-dev-tsm.c
    261 static int dsm_create(struct tio_dsm *dsm)
    262 {
    263         struct pci_dev *pdev = dsm->tsm.base_tsm.pdev;
    264         u8 segment_id = pdev->bus ? pci_domain_nr(pdev->bus) : 0;
                                ^^^^^^^^^
This line assumes "pdev->bus" can be NULL.

    265         struct pci_dev *rootport = pcie_find_root_port(pdev);
--> 266         u16 device_id = pci_dev_id(pdev);
                                           ^^^^
Unchecked dereference.

    267         u16 root_port_id;
    268         u32 lnkcap = 0;
    269 
    270         if (pci_read_config_dword(rootport, pci_pcie_cap(rootport) + PCI_EXP_LNKCAP,
    271                                   &lnkcap))
    272                 return -ENODEV;
    273 
    274         root_port_id = FIELD_GET(PCI_EXP_LNKCAP_PN, lnkcap);
    275 
    276         return sev_tio_dev_create(&dsm->data, device_id, root_port_id, segment_id);
    277 }

regards,
dan carpenter