eCryptfs: Check return of filemap_write_and_wait during fsync

Error out of ecryptfs_fsync() if filemap_write_and_wait() fails.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Cc: Paul Taysom <taysom@chromium.org>
Cc: Olof Johansson <olofj@chromium.org>
Cc: stable@vger.kernel.org # v3.6+

diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index 16f509d..a7abbea 100644 (file)
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -295,7 +295,12 @@ static int ecryptfs_release(struct inode *inode, struct file *file)
 static int
 ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 {
-       filemap_write_and_wait(file->f_mapping);
+       int rc;
+
+       rc = filemap_write_and_wait(file->f_mapping);
+       if (rc)
+               return rc;
+
        return vfs_fsync(ecryptfs_file_to_lower(file), datasync);
 }