linux-kernel - Re: [syzbot] [usb?] general protection fault in status

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Message-ID: <20250123113123.1744-1-hdanton@sina.com>
Date: Thu, 23 Jan 2025 19:31:22 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+83976e47ec1ef91e66f1@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] general protection fault in status_show

On Thu, 16 Jan 2025 22:14:23 -0800
> syzbot found the following issue on:
> 
> HEAD commit:    be548645527a Merge tag 'for-linus' of git://git.kernel.org..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12d51cb0580000

#syz test

--- x/drivers/usb/usbip/vhci_sysfs.c
+++ y/drivers/usb/usbip/vhci_sysfs.c
@@ -76,6 +76,8 @@ static ssize_t status_show_vhci(int pdev
 	}
 
 	hcd = platform_get_drvdata(pdev);
+	if (!usb_hcd_is_primary_hcd(hcd))
+		return 0;
 	vhci_hcd = hcd_to_vhci_hcd(hcd);
 	vhci = vhci_hcd->vhci;
 
--