Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:[EOL][EOL]mm/huge_memory: fix NULL pointer deference when splitting folio[EOL][EOL]Commit c010d47f107f ("mm: thp: split huge page to any lower order pages")[EOL]introduced an early check on the folio's order via mapping->flags before[EOL]proceeding with the split work.[EOL][EOL]This check introduced a bug: for shmem folios in the swap cache and[EOL]truncated folios, the mapping pointer can be NULL.  Accessing[EOL]mapping->flags in this state leads directly to a NULL pointer dereference.[EOL][EOL]This commit fixes the issue by moving the check for mapping != NULL before[EOL]any attempt to access mapping->flags.