Commit 2aeb3db1 authored Aug 30, 2007 by Ryusuke Konishi Committed by Linus Torvalds Aug 31, 2007

eCryptfs: fix possible fault in ecryptfs_sync_page

This will avoid a possible fault in ecryptfs_sync_page().

In the function, eCryptfs calls sync_page() method of a lower filesystem
without checking its existence. However, there are many filesystems that
don't have this method including network filesystems such as NFS, AFS, and
so forth. They may fail when an eCryptfs page is waiting for lock.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Acked-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 85787a2b

fs/ecryptfs/mmap.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -834,6 +834,7 @@ static void ecryptfs_sync_page(struct page *page)
		ecryptfs_printk(KERN_DEBUG, "find_lock_page failed\n");
		return;
		}
		if (lower_page->mapping->a_ops->sync_page)
		lower_page->mapping->a_ops->sync_page(lower_page);
		ecryptfs_printk(KERN_DEBUG, "Unlocking page with index = [0x%.16x]\n",
		lower_page->index);