block: Clear kernel memory before copying to user
If the kernel allocates a bounce buffer for user read data, this memory needs to be cleared before copying it to the user, otherwise it may leak kernel memory to user space. Laurence Oberman <loberman@redhat.com> Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -1260,6 +1260,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
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if (ret)
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goto cleanup;
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} else {
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zero_fill_bio(bio);
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iov_iter_advance(iter, bio->bi_iter.bi_size);
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}
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