CVE-2022-49327

Summary

CVE-2022-49327 is a vulnerability in the Linux kernel that could result in a journal no-space deadlock. In situations where all journal buckets are filled with active journal sets and heavy write I/O load, the cache set registration process could lead to a deadlock if a new journal bucket cannot be allocated during journal replay. To mitigate this issue, the patch introduces a new member "bool do_reserve" in struct journal, which is initially set to false and changed to true during cache set initialization. This reservation of one journal bucket ensures that there is always space available for journal replay, preventing the journal no-space deadlock from occurring.

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