From 55eea973b66c48c33bbae62c739b0b1435ae11ec Mon Sep 17 00:00:00 2001
From: Max Kellermann <max.kellermann@ionos.com>
Date: Tue, 8 Mar 2022 17:34:09 +0800
Subject: [PATCH] lib/iov_iter: initialize "flags" in new pipe_buffer
mainline inclusion
from mainline-v5.17-rc6
commit 9d2231c5d74e13b2a0546fee6737ee4446017903
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4WUKP?from=project-issue
CVE: CVE-2022-0847
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/lib/iov_iter.c?id=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>
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
---
lib/iov_iter.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index f0b2ccb1bb01..33a88a7e72d9 100644
--- 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);
--
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