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/I4X1GI?from=project-issue CVE: NA
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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: Laibin Qiu qiulaibin@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 25668139fc1f..b80320956caf 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -506,6 +506,7 @@ static size_t copy_page_to_iter_pipe(struct page *page, size_t offset, size_t by return 0; pipe->nrbufs++; buf->ops = &page_cache_pipe_buf_ops; + buf->flags = 0; get_page(buf->page = page); buf->offset = offset; buf->len = bytes; @@ -630,6 +631,7 @@ static size_t push_pipe(struct iov_iter *i, size_t size, break; pipe->nrbufs++; pipe->bufs[idx].ops = &default_pipe_buf_ops; + pipe->bufs[idx].flags = 0; pipe->bufs[idx].page = page; pipe->bufs[idx].offset = 0; if (left <= PAGE_SIZE) {