[PATCH AUTOSEL 4.19 41/73] block: Clear kernel memory before copying to user

[Sasha Levin]

From: Keith Busch <keith.bu...@intel.com>

[ Upstream commit f3587d76da05f68098ddb1cb3c98cc6a9e8a402c ]

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 <lober...@redhat.com>
Signed-off-by: Keith Busch <keith.bu...@intel.com>
Signed-off-by: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 block/bio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/bio.c b/block/bio.c
index 0093bed81c0e..41173710430c 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1261,6 +1261,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
                if (ret)
                        goto cleanup;
        } else {
+               zero_fill_bio(bio);
                iov_iter_advance(iter, bio->bi_iter.bi_size);
        }
 
-- 
2.17.1