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
XA_RETRY_ENTRY if there's process modifying the xarray concurrently.
This will cause oops when referring to the invalid entry.

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

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-49815
• https://git.kernel.org/stable/c/37020bbb71d911431e16c2c940b97cf86ae4f2f6
• https://git.kernel.org/stable/c/dbc98fe99e17ed18f2f272d5fe880d844b1c68c3