ALSA: pcm: Move rwsem lock inside snd_ctl_elem_read to prevent UAF

A use-after-free flaw was found in sndctlelemread in sound/core/control.c in Advanced Linux Sound Architecture ALSA subsystem in the Linux kernel. In this flaw a normal privileged, local attacker may impact the system due to a locking issue in the compat path, leading to a kernel information leak...

Vulnerability of the rwsem_down_write_slowpath function (kernel/locking/rwsem.c) in the Linux operating system’s kernel, which allows an attacker to disclose protected information or cause service failure

The vulnerability of the rwsemdownwriteslowpath function in the Linux kernel’s locking/rwsem.c file relates to operations that occur outside of the buffer memory. Exploiting this vulnerability could allow an attacker to disclose sensitive information or cause service failures...