iommu: Fix potential memory leak in iopf_queue_remove_device()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: iommu: Fix potential memory leak in iopf_queue_remove_device() The iopf_queue_remove_device() helper removes a device from the per-iommu iopf queue when PRI is disabled on the device. It responds to all outstanding iopf's with an IOMMU_PAGE_RESP_INVALID code and detaches the device from the queue. However, it fails to release the group structure that represents a group of iopf's awaiting for a response after responding to the hardware. This can cause a memory leak if iopf_queue_remove_device() is called with pending iopf's. Fix it by calling iopf_free_group() after the iopf group is responded.

References

• https://git.kernel.org/stable/c/db60d2d896a17decd58d143eef92cf22eb0a0176
• https://git.kernel.org/stable/c/90d5429cd2921ca2714684ed525898d431bb9283
• https://git.kernel.org/stable/c/9759ae2cee7cd42b95f1c48aa3749bd02b5ddb08