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+

1 files changed, 6 insertions, 1 deletions

diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index 16f509d6fa49..a7abbea2c096 100644
--- 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);
 }