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vfs: fix uninitialized flags in splice_to_pipe() 

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: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Miklos Szeredi 2017-02-16 17:49:02 +01:00 committed by syphyr
parent 0897ef769f
commit b86390767c
1 changed files with 1 additions and 0 deletions
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fs/splice.c
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@ -215,6 +215,7 @@ ssize_t splice_to_pipe(struct pipe_inode_info *pipe,
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;