Commit a4bb3ecd authored Apr 15, 2015 by Naoya Horiguchi Committed by Linus Torvalds Apr 15, 2015

mm/page-writeback: check-before-clear PageReclaim



With the page flag sanitization patchset, an invalid usage of
ClearPageReclaim() is detected in set_page_dirty().  This can be called
from __unmap_hugepage_range(), so let's check PageReclaim() before trying
to clear it to avoid the misuse.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent b3b3a99c

mm/page-writeback.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -2228,6 +2228,7 @@ int set_page_dirty(struct page *page)
		* it will confuse readahead and make it restart the size rampup
		* process. But it's a trivial problem.
		*/
		if (PageReclaim(page))
		ClearPageReclaim(page);
		#ifdef CONFIG_BLOCK
		if (!spd)