Bug 2363358 (CVE-2022-49815)

Summary: CVE-2022-49815 kernel: erofs: fix missing xas_retry() in fscache mode
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-05-01 15:01:17 UTC 
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.
Comment 1 Avinash Hanwate 2025-05-02 04:54:05 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025050131-CVE-2022-49815-ebd2@gregkh/T