In the Linux kernel, the following vulnerability has been resolved: mm/pagealloc: don't call pfntopage() on possibly non-existent PFN in splitlargebuddy() In splitlargebuddy(), we might call pfntopage() on a PFN that might not exist. In corner cases, such as when freeing the highest pageblock in the last memory section, this could result with CONFIGSPARSEMEM && !CONFIGSPARSEMEMEXTREME in _pfntosection() returning NULL and and _sectionmemmapaddr() dereferencing that NULL pointer. Let's fix it, and avoid doing a pfnto_page() call for the first iteration, where we already have the page. So far this was found by code inspection, but let's just CC stable as the fix is easy.
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