CVE-2024-39491

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

ALSA: hda: cs35l56: Fix lifetime of cs_dsp instance

The cs_dsp instance is initialized in the driver probe() so it should be freed in the driver remove(). Also fix a missing call to cs_dsp_remove() in the error path of cs35l56_hda_common_probe().

The call to cs_dsp_remove() was being done in the component unbind callback cs35l56_hda_unbind(). This meant that if the driver was unbound and then re-bound it would be using an uninitialized cs_dsp instance.

It is best to initialize the cs_dsp instance in probe() so that it can return an error if it fails. The component binding API doesnt have any error handling so theres no way to handle a failure if cs_dsp was initialized in the bind.

Affected Software

References

• https://git.kernel.org/stable/c/60d5e087e5f334475b032ad7e6ad849fb998f303
• https://git.kernel.org/stable/c/9054c474f9c219e58a441e401c0e6e38fe713ff1
• https://git.kernel.org/stable/c/d344873c4cbde249b7152d36a273bcc45864001e