Commit 496a51b3 authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe
Browse files

lib/iov_iter.c: initialize bi.bi_idx before iterating over bvec 



Initialize bi.bi_idx as 0 before iterating over bvec, otherwise
garbage data can be used as ->bi_idx.

Cc: Christoph Hellwig <hch@lst.de>
Reported-and-tested-by: default avatarKlara Modin <klarasmodin@gmail.com>
Fixes: e4e535bf ("iov_iter: don't require contiguous pages in iov_iter_extract_bvec_pages")
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 133008e8

lib/iov_iter.c

+1 −0
Original line number Diff line number Diff line
@@ -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;