Hi,
there's another race I failed to see.
This shortened version of quite common code is racy:
usb_unlink_urb(u);
kfree(u);
MOD_DEC_USE_COUNT;
It would have to be:
usb_unlink_urb();
usb_wait_for_completion_handler(); //to be written
kfree(u);
MOD_DEC_USE_COUNT;
The problem is that the completion handler itself can't provide
that hypothetical function, because itself might be unloaded.
Regards
Oliver
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