USB: usbip: fix null-ptr-deref in status_show_vhci()

If usb_add_hcd() fails in vhci_hcd_probe() (i.e., a probe failure), the error path calls usb_remove_hcd() and also sets pdev->dev.driver_data to NULL.

Consequently, any subsequent call to platform_get_drvdata(pdev) (which returns pdev->dev.driver_data) may yield NULL, causing a crash if that pointer is dereferenced.

Fix this by adding a sanity check to ensure "hcd" is non-NULL before proceeding with further operations.

---
 drivers/usb/usbip/vhci_sysfs.c | 3 +++
 1 file changed, 3 insertions(+)

index d5865460e82d..d4a1aa6d06b2 100644
@@ -76,6 +76,9 @@ static ssize_t status_show_vhci(int pdev_nr, char *out)
 	}
 
 	hcd = platform_get_drvdata(pdev);
+	if (!hcd)
+		return 0;
+
 	vhci_hcd = hcd_to_vhci_hcd(hcd);
 	vhci = vhci_hcd->vhci;
 

2.39.5

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him a patch that has triggered this response. He used to manually respond to these common problems, but in order to save his sanity (he kept writing the same thing over and over, yet to different people), I was created. Hopefully you will not take offence and will fix the problem in your patch and resubmit it so that it can be accepted into the Linux kernel tree.

You are receiving this message because of the following common error(s) as indicated below:

- This looks like a new version of a previously submitted patch, but you did not list below the --- line any changes from the previous version. Please read the section entitled "The canonical patch format" in the kernel file, Documentation/process/submitting-patches.rst for what needs to be done here to properly describe this.

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thanks,

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