redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

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>
hifive-unleashed-5.1
Ryusuke Konishi 2007-08-30 23:56:33 -07:00 committed by Linus Torvalds
parent 85787a2bea
commit 2aeb3db17f
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/ecryptfs/mmap.c
View File

@ -834,7 +834,8 @@ static void ecryptfs_sync_page(struct page *page)
ecryptfs_printk(KERN_DEBUG, "find_lock_page failed\n");
return;
}
lower_page->mapping->a_ops->sync_page(lower_page);
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);
unlock_page(lower_page);