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The single allocation site covers every use of it: bytes no discard has written stay zero, and bytes one did write hold that controller's own range list, which it has already been sent
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commit 7cfc41f8e80f11ffa8382ed1a505154ceffb79c7 Author: Greg Kroah

https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.18.50
When the kernel tree lives under a private home directory (mode 0750, the Ubuntu default for new users since 21

commit 81d3924095fd017e473332a9b6dd6dd0e3d9a59b Author: Greg Kroah

https://cdn.kernel.org/pub/linux/kernel/v7.x/ChangeLog-7.1.13
After a disconnect the usbfs reference can be the last one, in which case usb_put_dev() frees the device and the subsequent loop reads offset 80 of freed memory and uses the result as a struct usb_hcd *, which hcd_buffer_free_pages() then dereferences

commit 8b73de7da85fde281a385e0b26eda9bffd3ca477 Author: Greg Kroah

https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.156
After a disconnect the usbfs reference can be the last one, in which case usb_put_dev() frees the device and the subsequent loop reads offset 80 of freed memory and uses the result as a struct usb_hcd *, which hcd_buffer_free_pages() then dereferences