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

commit 8eb29c4fbf upstream.

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: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mikulas Patocka 2023-01-22 14:03:31 -05:00 committed by Greg Kroah-Hartman
parent be360c83f2
commit 70a135c6d1
1 changed files with 2 additions and 1 deletions
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3
drivers/md/dm-flakey.c
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@ -307,8 +307,9 @@ static void corrupt_bio_data(struct bio *bio, struct flakey_c *fc)
struct page *page = bio_iter_page(bio, iter); struct page *page = bio_iter_page(bio, iter);
if (unlikely(page == ZERO_PAGE(0))) if (unlikely(page == ZERO_PAGE(0)))
break; break;
segment = (page_address(page) + bio_iter_offset(bio, iter)); segment = bvec_kmap_local(&bvec);
segment[corrupt_bio_byte] = fc->corrupt_bio_value; segment[corrupt_bio_byte] = fc->corrupt_bio_value;
kunmap_local(segment);
DMDEBUG("Corrupting data bio=%p by writing %u to byte %u " DMDEBUG("Corrupting data bio=%p by writing %u to byte %u "
"(rw=%c bi_opf=%u bi_sector=%llu size=%u)\n", "(rw=%c bi_opf=%u bi_sector=%llu size=%u)\n",
bio, fc->corrupt_bio_value, fc->corrupt_bio_byte, bio, fc->corrupt_bio_value, fc->corrupt_bio_byte,