In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: Use snd_card_free_when_closed() at disconnection The USB disconnect callback is supposed to be short and not too-long waiting. OTOH, the current code uses snd_card_free() at disconnection, but this waits for the close of all used fds, hence it can take long. It eventually blocks the upper layer USB ioctls, which may trigger a soft lockup. An easy workaround is to replace snd_card_free() with snd_card_free_when_closed(). This variant returns immediately while the release of resources is done asynchronously by the card device release at the last close. This patch also splits the code to the disconnect and the free phases; the former is called immediately at the USB disconnect callback while the latter is called from the card destructor.
History

Fri, 27 Dec 2024 14:15:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: Use snd_card_free_when_closed() at disconnection The USB disconnect callback is supposed to be short and not too-long waiting. OTOH, the current code uses snd_card_free() at disconnection, but this waits for the close of all used fds, hence it can take long. It eventually blocks the upper layer USB ioctls, which may trigger a soft lockup. An easy workaround is to replace snd_card_free() with snd_card_free_when_closed(). This variant returns immediately while the release of resources is done asynchronously by the card device release at the last close. This patch also splits the code to the disconnect and the free phases; the former is called immediately at the USB disconnect callback while the latter is called from the card destructor.
Title ALSA: caiaq: Use snd_card_free_when_closed() at disconnection
References

cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-12-27T14:11:14.161Z

Updated: 2024-12-27T14:11:14.161Z

Reserved: 2024-12-27T14:03:05.984Z

Link: CVE-2024-56531

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2024-12-27T14:15:32.503

Modified: 2024-12-27T14:15:32.503

Link: CVE-2024-56531

cve-icon Redhat

No data.