[PATCH 4.4 01/15] vfs: fix uninitialized flags in splice_to_pipe()
From: Greg Kroah-Hartman
Date: Tue Feb 21 2017 - 08:03:06 EST
4.4-stable review patch. If anyone has any objections, please let me know.
From: Miklos Szeredi <mszeredi@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
fs/splice.c | 1 +
1 file changed, 1 insertion(+)
@@ -211,6 +211,7 @@ 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;