patches/kernel/0014-lib-iov_iter-initialize-flags-in-new-pipe_buffer.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: Max Kellermann <max.kellermann@ionos.com>
   3 Date: Mon, 21 Feb 2022 11:03:13 +0100
   4 Subject: [PATCH] lib/iov_iter: initialize "flags" in new pipe_buffer
   5
   6 commit 9d2231c5d74e13b2a0546fee6737ee4446017903 upstream.
   7
   8 The functions copy_page_to_iter_pipe() and push_pipe() can both
   9 allocate a new pipe_buffer, but the "flags" member initializer is
  10 missing.
  11
  12 Fixes: 241699cd72a8 ("new iov_iter flavour: pipe-backed")
  13 To: Alexander Viro <viro@zeniv.linux.org.uk>
  14 To: linux-fsdevel@vger.kernel.org
  15 To: linux-kernel@vger.kernel.org
  16 Cc: stable@vger.kernel.org
  17 Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
  18 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
  19 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  20 Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
  21 ---
  22  lib/iov_iter.c | 2 ++
  23  1 file changed, 2 insertions(+)
  24
  25 diff --git a/lib/iov_iter.c b/lib/iov_iter.c
  26 index 9ffa7dc197be..fa5827e2e9a3 100644
  27 --- a/lib/iov_iter.c
  28 +++ b/lib/iov_iter.c
  29 @@ -449,6 +449,7 @@ static size_t copy_page_to_iter_pipe(struct page *page, size_t offset, size_t by
  30                 return 0;
  31
  32         buf->ops = &page_cache_pipe_buf_ops;
  33 +       buf->flags = 0;
  34         get_page(page);
  35         buf->page = page;
  36         buf->offset = offset;
  37 @@ -564,6 +565,7 @@ static size_t push_pipe(struct iov_iter *i, size_t size,
  38                         break;
  39
  40                 buf->ops = &default_pipe_buf_ops;
  41 +               buf->flags = 0;
  42                 buf->page = page;
  43                 buf->offset = 0;
  44                 buf->len = min_t(ssize_t, left, PAGE_SIZE);