CVE-2023-53183

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> btrfs: exit gracefully if reloc roots don&amp;#39;t match<br /> <br /> [BUG]<br /> Syzbot reported a crash that an ASSERT() got triggered inside<br /> prepare_to_merge().<br /> <br /> [CAUSE]<br /> The root cause of the triggered ASSERT() is we can have a race between<br /> quota tree creation and relocation.<br /> <br /> This leads us to create a duplicated quota tree in the<br /> btrfs_read_fs_root() path, and since it&amp;#39;s treated as fs tree, it would<br /> have ROOT_SHAREABLE flag, causing us to create a reloc tree for it.<br /> <br /> The bug itself is fixed by a dedicated patch for it, but this already<br /> taught us the ASSERT() is not something straightforward for<br /> developers.<br /> <br /> [ENHANCEMENT]<br /> Instead of using an ASSERT(), let&amp;#39;s handle it gracefully and output<br /> extra info about the mismatch reloc roots to help debug.<br /> <br /> Also with the above ASSERT() removed, we can trigger ASSERT(0)s inside<br /> merge_reloc_roots() later.<br /> Also replace those ASSERT(0)s with WARN_ON()s.