Initialize bi.bi_idx as 0 before iterating over bvec, otherwise
garbage data can be used as ->bi_idx.
Cc: Christoph Hellwig <hch@xxxxxx>
Reported-and-tested-by: Klara Modin <klarasmodin@xxxxxxxxx>
Fixes: e4e535bff2bc ("iov_iter: don't require contiguous pages in iov_iter_extract_bvec_pages")
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
lib/iov_iter.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 9fc06f5fb748..c761f6db3cb4 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1699,6 +1699,7 @@ static ssize_t iov_iter_extract_bvec_pages(struct iov_iter *i,
i->bvec++;
skip = 0;
}
+ bi.bi_idx = 0;
bi.bi_size = maxsize + skip;
bi.bi_bvec_done = skip;
--
2.44.0
