On Mon, Oct 5, 2020 at 5:18 PM Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > On Mon, Oct 05, 2020 at 05:08:11PM +0200, Andrey Konovalov wrote: > > Dear USB and USB/IP maintainers, > > > > While fuzzing the USB/IP stack with syzkaller we've stumbled upon an issue. > > > > Currently kcov (the subsystem that is used for coverage collection) > > USB-related callbacks assume that usb_hcd_giveback_urb() can only be > > called from interrupt context, as indicated by the comment before the > > function definition. In the USB/IP code, however, it's called from the > > task context (see the stack trace below). > > > > Is this something that is allowed and we need to fix kcov? Or is this > > a bug in USB/IP? > > It's a bug in kcov, and is not true as you have found out :) OK, I see, I'll work on a fix, thanks! Should I also update the comment above usb_hcd_giveback_urb() to mention that it can be called in_task()? Or is this redundant and is assumed in general?
