CVE-2023-52587 IB/ipoib: Fix mcast list locking

In the Linux kernel, the following vulnerability has been resolved: IB/ipoib: Fix mcast list locking Releasing the priv-lock while iterating the priv-multicastlist in ipoibmcastjointask opens a window for ipoibmcastdevflush to remove the items while in the middle of iteration. If the mcast is...