OCFS2 reflink inline xattr space reservation fix for filesystem corruption

From this webpage screenshot, we can extract the following key information about the vulnerability: 1. Vulnerability Description: - A customer reported a crash and corruption of the ocfs2 filesystem. - The crash was triggered by the detection of corruption. - Debugging revealed that output showed the following corruption: 2. Root Cause: - The issue occurred during the reflink workflow when reserving space for inline xattr. - The problematic function is . - When this function is called, the reflink tree has already been rebuilt in the target inode, without checking whether the target inode is in the root metadata block. - The function simply decrements from 243 to 227, allocating 256 bytes for the inline xattr, while the inode has already expanded beyond this index (in this case, up to 230), leading to corruption. 3. Fix: - The fix involves reserving space for the target inode before rebuilding the reflink tree. - The customer has validated the fix. 4. Patch Details: - The code patch modifies the function to properly handle space reservation for inline xattr. - Detailed content of the patch can be found in the patch's diff output. 5. Patch Link: - Detailed information and the diff output of the patch are available at the provided link. This information helps us understand the vulnerability's context, root cause, mitigation, and specific code changes in the patch.

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OCFS2 reflink inline xattr space reservation fix for filesystem corruption