• Johan Hovold's avatar
    USB: serial: mos7720: fix use-after-free on probe errors · 2f525ed5
    Johan Hovold authored
    commit 91a1ff4d upstream.
    
    The interrupt URB was submitted on probe but never stopped on probe
    errors. This can lead to use-after-free issues in the completion
    handler when accessing the freed usb-serial struct:
    
    Unable to handle kernel paging request at virtual address 6b6b6be7
    ...
    [<bf052e70>] (mos7715_interrupt_callback [mos7720]) from [<c052a894>] (__usb_hcd_giveback_urb+0x80/0x140)
    [<c052a894>] (__usb_hcd_giveback_urb) from [<c052a9a4>] (usb_hcd_giveback_urb+0x50/0x138)
    [<c052a9a4>] (usb_hcd_giveback_urb) from [<c0550684>] (musb_giveback+0xc8/0x1cc)
    
    Fixes: b69578df ("USB: usbserial: mos7720: add support for parallel port on moschip 7715")
    Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    2f525ed5
mos7720.c 57.5 KB