lib/iov_iter: initialize "flags" in new pipe_buffer

Origin: https://git.kernel.org/linus/9d2231c5d74e13b2a0546fee6737ee4446017903

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>
Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name lib-iov_iter-initialize-flags-in-new-pipe_buffer.patch

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index b364231b5fc8cc629f3cdf496e2b3a72ec5efbd3..1b0a349fbcd926b4e49e48728c545395e0ae6bf5 100644 (file)
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -407,6 +407,7 @@ 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;
@@ -543,6 +544,7 @@ 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);