CVE-2025-38105

In the Linux kernel, the following vulnerability has been resolved:

ALSA: usb-audio: Kill timer properly at removal

The USB-audio MIDI code initializes the timer, but in a rare case, the

driver might be freed without the disconnect call. This leaves the

timer in an active state while the assigned object is released via

snd_usbmidi_free(), which ends up with a kernel warning when the debug

configuration is enabled, as spotted by fuzzer.

For avoiding the problem, put timer_shutdown_sync() at

snd_usbmidi_free(), so that the timer can be killed properly.

While we're at it, replace the existing timer_delete_sync() at the

disconnect callback with timer_shutdown_sync(), too.