The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.14.y git checkout FETCH_HEAD git cherry-pick -x 8eb29c4fbf9661e6bd4dd86197a37ffe0ecc9d50 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable@xxxxxxxxxxxxxxx>' --in-reply-to '167819226054249@xxxxxxxxx' --subject-prefix 'PATCH 4.14.y' HEAD^.. Possible dependencies: 8eb29c4fbf96 ("dm flakey: fix a bug with 32-bit highmem systems") f50714b57aec ("dm flakey: don't corrupt the zero page") a00f5276e266 ("dm flakey: Properly corrupt multi-page bios.") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 8eb29c4fbf9661e6bd4dd86197a37ffe0ecc9d50 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka <mpatocka@xxxxxxxxxx> Date: Sun, 22 Jan 2023 14:03:31 -0500 Subject: [PATCH] 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@xxxxxxxxxxxxxxx Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx> Reviewed-by: Sweet Tea Dorminy <sweettea-kernel@xxxxxxxxxx> Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx> diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c index ff9ca5b2a47e..33608d436cec 100644 --- a/drivers/md/dm-flakey.c +++ b/drivers/md/dm-flakey.c @@ -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,
