From: Max Kellermann max.kellermann@ionos.com

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/li...

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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 b364231b5fc8..1b0a349fbcd9 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);