linux-kernel - [PATCH 3.16 303/370] vfs: fix uninitialized flags in splice_to

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Message-ID: <lsq.1489146383.591490832@decadent.org.uk>
Date:   Fri, 10 Mar 2017 11:46:23 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Miklos Szeredi" <mszeredi@...hat.com>
Subject: [PATCH 3.16 303/370] vfs: fix uninitialized flags in splice_to_pipe()

3.16.42-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Miklos Szeredi <mszeredi@...hat.com>

commit 5a81e6a171cdbd1fa8bc1fdd80c23d3d71816fac upstream.

Flags (PIPE_BUF_FLAG_PACKET, PIPE_BUF_FLAG_GIFT) could remain on the
unused part of the pipe ring buffer.  Previously splice_to_pipe() left
the flags value alone, which could result in incorrect behavior.

Uninitialized flags appears to have been there from the introduction of
the splice syscall.

Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
[bwh: Backported to 3.16: adjust context, indentation]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/splice.c | 1 +
 1 file changed, 1 insertion(+)

--- a/fs/splice.c
+++ b/fs/splice.c
@@ -212,6 +212,7 @@ ssize_t splice_to_pipe(struct pipe_inode
 			buf->len = spd->partial[page_nr].len;
 			buf->private = spd->partial[page_nr].private;
 			buf->ops = spd->ops;
+			buf->flags = 0;
 			if (spd->flags & SPLICE_F_GIFT)
 				buf->flags |= PIPE_BUF_FLAG_GIFT;