Andrea Arcangeli: get_user_pages() shall not grab PG_reserved pages

Linux Kernel Mailing List <[email protected]> Wed, 16 Mar 2005 15:25:52 +0000

Newsgroups	gmane.linux.kernel.commits.2-4
Message-ID	<[email protected]>

ChangeSet 1.1582, 2005/03/16 12:25:52-03:00, [email protected]

	Andrea Arcangeli: get_user_pages() shall not grab PG_reserved pages



 memory.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)


diff -Nru a/mm/memory.c b/mm/memory.c
--- a/mm/memory.c	2005-03-16 15:03:06 -08:00
+++ b/mm/memory.c	2005-03-16 15:03:06 -08:00
@@ -499,9 +499,11 @@
 				/* FIXME: call the correct function,
 				 * depending on the type of the found page
 				 */
-				if (!pages[i])
-					goto bad_page;
-				page_cache_get(pages[i]);
+				if (!pages[i] || PageReserved(pages[i])) {
+					if (pages[i] != ZERO_PAGE(start))
+						goto bad_page;
+				} else
+					page_cache_get(pages[i]);
 			}
 			if (vmas)
 				vmas[i] = vma;