[Bug 195489] New: esas2r: unchecked return value of pci_enable_device() in function esas2r_resume()

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=195489

            Bug ID: 195489
           Summary: esas2r: unchecked return value of pci_enable_device()
                    in function esas2r_resume()
           Product: SCSI Drivers
           Version: 2.5
    Kernel Version: linux-4.11-rc7
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: scsi_drivers-other@kernel-bugs.osdl.org
          Reporter: bianpan2010@ruc.edu.cn
        Regression: No

In file drivers/scsi/esas2r/esas2r_init.c, function esas2r_resume() calls the
function pci_enable_device() (at line 730), but forget to detect its return
value. The function pci_enable_device() will return a negative value on errors.
The return value should be validated before continuing. The related code
snippet is shown as follows.

esas2r_resume @@ drivers/scsi/esas2r/esas2r_init.c: 710
 710 int esas2r_resume(struct pci_dev *pdev)
 711 {
 712     struct Scsi_Host *host = pci_get_drvdata(pdev);
         ...
 730     rez = pci_enable_device(pdev);
 731     pci_set_master(pdev);
 732 
 733     if (!a) {
 734         rez = -ENODEV;
 735         goto error_exit;
 736     }
         ...
 774 error_exit:
 775     esas2r_log_dev(ESAS2R_LOG_CRIT, &(pdev->dev), "esas2r_resume(): %d",
 776                rez);
 777     return rez;
 778 }

Generally, the function pci_enable_device() is called in the following way.
ide_pci_resume @@ drivers/ide/setup-pci.c: 645
645 int ide_pci_resume(struct pci_dev *dev)
646 {
647     struct ide_host *host = pci_get_drvdata(dev);
648     int rc;
649 
650     pci_set_power_state(dev, PCI_D0);
651 
652     rc = pci_enable_device(dev);
653     if (rc)
654         return rc;
655 
656     pci_restore_state(dev);
657     pci_set_master(dev);
658 
659     if (host->init_chipset)
660         host->init_chipset(dev);
661 
662     return 0;
663 }

Thanks for your attention!

Pan Bian

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