linux-kernel - [PATCH 4.1 125/127] fix the regression from "direct-io: Fix negative return from dio read beyond eof"

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Date:	Wed, 27 Jan 2016 10:14:49 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 4.1 125/127] fix the regression from "direct-io: Fix negative return from dio read beyond eof"

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

------------------

From: Al Viro <viro@...iv.linux.org.uk>

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@...iv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/direct-io.c |    1 +
 1 file changed, 1 insertion(+)

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