4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Keith Busch <keith.bu...@intel.com>
commit f55adad601c6a97c8c9628195453e0fb23b4a0ae upstream.
We don't need to zero fill the bio if not using kernel allocated pages.
Fixes: f3587d76da05 ("block: Clear kernel memory before copying to user") #
v4.20-rc2
Reported-by: Todd Aiken <tai...@mvtech.ca>
Cc: Laurence Oberman <lober...@redhat.com>
Cc: sta...@vger.kernel.org
Cc: Bart Van Assche <bvanass...@acm.org>
Tested-by: Laurence Oberman <lober...@redhat.com>
Signed-off-by: Keith Busch <keith.bu...@intel.com>
Signed-off-by: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
block/bio.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/block/bio.c
+++ b/block/bio.c
@@ -1262,7 +1262,8 @@ struct bio *bio_copy_user_iov(struct req
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);
}
