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CVE-2024-56532

In the Linux kernel, the following vulnerability has been resolved: ALSA: us122l: Use snd_card_free_when_closed() at disconnection The USB disconnect callback …

Impact

In the Linux kernel, the following vulnerability has been resolved: ALSA: us122l: 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. The loop of us122l->mmap_count check is dropped as well. The check is useless for the asynchronous operation with *_when_closed().

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 2.6.28 before 4.19.325
from 4.20 before 5.4.287
from 5.5 before 5.10.231
from 5.11 before 5.15.174
from 5.16 before 6.1.120
from 6.2 before 6.6.64

Weakness classification

CWE-667

References