lib/iov_iter: initialize "flags" in new pipe_buffer

commit 9d2231c5d74e13b2a0546fee6737ee4446017903 upstream.

The functions copy_page_to_iter_pipe() and push_pipe() can both
allocate a new pipe_buffer, but the "flags" member initializer is
missing.

Fixes: 241699cd72a8 ("new iov_iter flavour: pipe-backed")
To: Alexander Viro <viro@zeniv.linux.org.uk>
To: linux-fsdevel@vger.kernel.org
To: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 60b5e6edfbaa77865bb7ec763293786b6e91b54f..c5b2f0f4b8a8448671707266296ff4ac02731a92 100644 (file)
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -416,6 +416,7 @@ static size_t copy_page_to_iter_pipe(struct page *page, size_t offset, size_t by
                return 0;
 
        buf->ops = &page_cache_pipe_buf_ops;
+       buf->flags = 0;
        get_page(page);
        buf->page = page;
        buf->offset = offset;
@@ -532,6 +533,7 @@ static size_t push_pipe(struct iov_iter *i, size_t size,
                        break;
 
                buf->ops = &default_pipe_buf_ops;
+               buf->flags = 0;
                buf->page = page;
                buf->offset = 0;
                buf->len = min_t(ssize_t, left, PAGE_SIZE);