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block/bio: Do not zero user pages

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We don't need to zero fill the bio if not using kernel allocated pages.

Fixes: f3587d76da ("block: Clear kernel memory before copying to user") # v4.20-rc2
Reported-by: Todd Aiken <[email protected]>
Cc: Laurence Oberman <[email protected]>
Cc: [email protected]
Cc: Bart Van Assche <[email protected]>
Tested-by: Laurence Oberman <[email protected]>
Signed-off-by: Keith Busch <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Keith Busch 2018-12-10 08:44:42 -07:00 • committed by Jens Axboe
commit f55adad601
1 changed files with 2 additions and 1 deletions
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3
block/bio.c
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@ -1261,7 +1261,8 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
if (ret)
goto cleanup;
} else {
zero_fill_bio(bio);
if (bmd->is_our_pages)
zero_fill_bio(bio);
iov_iter_advance(iter, bio->bi_iter.bi_size);
}