Commit 8eb29c4f authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Mike Snitzer
Browse files

dm flakey: fix a bug with 32-bit highmem systems 



The function page_address does not work with 32-bit systems with high
memory. Use bvec_kmap_local/kunmap_local instead.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Reviewed-by: default avatarSweet Tea Dorminy <sweettea-kernel@dorminy.me>
Signed-off-by: default avatarMike Snitzer <snitzer@kernel.org>
parent f50714b5

drivers/md/dm-flakey.c

+2 −1
Original line number Diff line number Diff line
@@ -307,8 +307,9 @@ static void corrupt_bio_data(struct bio *bio, struct flakey_c *fc) 
			struct page *page = bio_iter_page(bio, iter);

			if (unlikely(page == ZERO_PAGE(0)))

				break;

			segment = (page_address(page) + bio_iter_offset(bio, iter));

			segment = bvec_kmap_local(&bvec);

			segment[corrupt_bio_byte] = fc->corrupt_bio_value;

			kunmap_local(segment);

			DMDEBUG("Corrupting data bio=%p by writing %u to byte %u "

				"(rw=%c bi_opf=%u bi_sector=%llu size=%u)\n",

				bio, fc->corrupt_bio_value, fc->corrupt_bio_byte,