CVE-2022-49815

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

erofs: fix missing xas_retry() in fscache mode

The xarray iteration only holds the RCU read lock and thus may encounter XARETRYENTRY if there's process modifying the xarray concurrently. This will cause oops when referring to the invalid entry.

Fix this by adding the missing xasretry(), which will make the iteration wind back to the root node if XARETRY_ENTRY is encountered.