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Change History

In the Linux kernel, the following vulnerability has been resolved:

mm/huge_memory: fix NULL pointer deference when splitting folio

Commit c010d47f107f ("mm: thp: split huge page to any lower order pages")
introduced an early check on the folio's order via mapping->flags before
proceeding with the split work.

This check introduced a bug: for shmem folios in the swap cache and
truncated folios, the mapping pointer can be NULL.  Accessing
mapping->flags in this state leads directly to a NULL pointer dereference.

This commit fixes the issue by moving the check for mapping != NULL before
any attempt to access mapping->flags.

https://git.kernel.org/stable/c/592db83615a9f0164472ec789c2ed34ad35f732f

https://git.kernel.org/stable/c/cff47b9e39a6abf03dde5f4f156f841b0c54bba0

https://git.kernel.org/stable/c/d1b83fbacd4397a1d2f8c6b13427a8636ae2b307