[PATCH 4.2.y-ckt 160/305] fix the regression from "direct-io: Fix negative return from dio read beyond eof"

[Kamal Mostafa]

4.2.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>

commit 2d4594acbf6d8f75a27f3578476b6a27d8b13ebb upstream.

Sure, it's better to bail out of past-the-eof read and return 0 than return
a bogus negative value on such.  Only we'd better make sure we are bailing out
with 0 and not -ENOMEM...

Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
 fs/direct-io.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/direct-io.c b/fs/direct-io.c
index 6bc4bac..d83a021 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -1165,6 +1165,7 @@ do_blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
 		if (dio->flags & DIO_LOCKING)
 			mutex_unlock(&inode->i_mutex);
 		kmem_cache_free(dio_cache, dio);
+		retval = 0;
 		goto out;
 	}
 
-- 
1.9.1