Patch "vfs: fix uninitialized flags in splice_to_pipe()" has been added to the 4.9-stable tree

Patch "vfs: fix uninitialized flags in splice_to_pipe()" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    vfs: fix uninitialized flags in splice_to_pipe()

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     vfs-fix-uninitialized-flags-in-splice_to_pipe.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 5a81e6a171cdbd1fa8bc1fdd80c23d3d71816fac Mon Sep 17 00:00:00 2001
From: Miklos Szeredi <mszeredi@redhat.com>
Date: Thu, 16 Feb 2017 17:49:02 +0100
Subject: vfs: fix uninitialized flags in splice_to_pipe()

From: Miklos Szeredi <mszeredi@redhat.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@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/fs/splice.c
+++ b/fs/splice.c
@@ -203,6 +203,7 @@ 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;
 
 		pipe->nrbufs++;
 		page_nr++;


Patches currently in stable-queue which might be from mszeredi@redhat.com are

queue-4.9/vfs-fix-uninitialized-flags-in-splice_to_pipe.patch
queue-4.9/fuse-fix-uninitialized-flags-in-pipe_buffer.patch
queue-4.9/fuse-fix-use-after-free-issue-in-fuse_dev_do_read.patch