CVE-2024-56532

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ALSA: us122l: Use snd_card_free_when_closed() at disconnection<br /> <br /> The USB disconnect callback is supposed to be short and not too-long<br /> waiting. OTOH, the current code uses snd_card_free() at<br /> disconnection, but this waits for the close of all used fds, hence it<br /> can take long. It eventually blocks the upper layer USB ioctls, which<br /> may trigger a soft lockup.<br /> <br /> An easy workaround is to replace snd_card_free() with<br /> snd_card_free_when_closed(). This variant returns immediately while<br /> the release of resources is done asynchronously by the card device<br /> release at the last close.<br /> <br /> The loop of us122l-&gt;mmap_count check is dropped as well. The check is<br /> useless for the asynchronous operation with *_when_closed().