Sasha Levin reported KASAN splash inside isolate_migratepages_range(). Problem is in function __is_movable_balloon_page() which tests AS_BALLOON_MAP in page->mapping->flags. This function has no protection against anonymous pages. As result it tried to check address space flags in inside anon-vma.
Signed-off-by: Konstantin Khlebnikov <[email protected]> Reported-by: Sasha Levin <[email protected]> Link: http://lkml.kernel.org/p/[email protected] Cc: stable <[email protected]> # v3.8 --- include/linux/balloon_compaction.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/balloon_compaction.h b/include/linux/balloon_compaction.h index 089743a..53d482e 100644 --- a/include/linux/balloon_compaction.h +++ b/include/linux/balloon_compaction.h @@ -128,7 +128,7 @@ static inline bool page_flags_cleared(struct page *page) static inline bool __is_movable_balloon_page(struct page *page) { struct address_space *mapping = page->mapping; - return mapping_balloon(mapping); + return !PageAnon(page) && mapping_balloon(mapping); } /* -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
