Bug 2320272 (CVE-2024-47757)

Summary: CVE-2024-47757 kernel: nilfs2: fix potential oob read in nilfs_btree_check_delete()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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OS: Linux   
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Bug Depends On: 2320342    
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Description OSIDB Bzimport 2024-10-21 13:07:18 UTC 
In the Linux kernel, the following vulnerability has been resolved:

nilfs2: fix potential oob read in nilfs_btree_check_delete()

The function nilfs_btree_check_delete(), which checks whether degeneration
to direct mapping occurs before deleting a b-tree entry, causes memory
access outside the block buffer when retrieving the maximum key if the
root node has no entries.

This does not usually happen because b-tree mappings with 0 child nodes
are never created by mkfs.nilfs2 or nilfs2 itself.  However, it can happen
if the b-tree root node read from a device is configured that way, so fix
this potential issue by adding a check for that case.
Comment 1 Robb Gatica 2024-10-21 15:03:47 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102115-CVE-2024-47757-2b1e@gregkh/T