ext4: fix unbalanced up_write() in ext4_ext_truncate() error path

ext4_ext_truncate() should not invoke up_write(&EXT4_I(inode)->i_data_sem)
when ext4_orphan_add() returns an error, as it hasn't performed a
down_write() yet. This trivial patch fixes this by moving the up_write()
invocation above the out_stop label.

Signed-off-by: Eric Gouriou <egouriou@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 4444317d141a..4e2bdc26b85c 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3450,8 +3450,9 @@ void ext4_ext_truncate(struct inode *inode)
         if (IS_SYNC(inode))
                 ext4_handle_sync(handle);
 
-out_stop:
         up_write(&EXT4_I(inode)->i_data_sem);
+
+out_stop:
         /*
          * If this was a simple ftruncate() and the file will remain alive,
          * then we need to clear up the orphan record which we created above.