linux-kernel - [PATCH 5.10 079/599] dm integrity: set journal entry unused when shrinking device

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Date:   Tue,  5 Apr 2022 09:26:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mikulas Patocka <mpatocka@...hat.com>,
        Milan Broz <gmazyland@...il.com>,
        Mike Snitzer <snitzer@...nel.org>
Subject: [PATCH 5.10 079/599] dm integrity: set journal entry unused when shrinking device

From: Mikulas Patocka <mpatocka@...hat.com>

commit cc09e8a9dec4f0e8299e80a7a2a8e6f54164a10b upstream.

Commit f6f72f32c22c ("dm integrity: don't replay journal data past the
end of the device") skips journal replay if the target sector points
beyond the end of the device. Unfortunatelly, it doesn't set the
journal entry unused, which resulted in this BUG being triggered:
BUG_ON(!journal_entry_is_unused(je))

Fix this by calling journal_entry_set_unused() for this case.

Fixes: f6f72f32c22c ("dm integrity: don't replay journal data past the end of the device")
Cc: stable@...r.kernel.org # v5.7+
Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
Tested-by: Milan Broz <gmazyland@...il.com>
[snitzer: revised header]
Signed-off-by: Mike Snitzer <snitzer@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/md/dm-integrity.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -2354,9 +2354,11 @@ static void do_journal_write(struct dm_i
 					dm_integrity_io_error(ic, "invalid sector in journal", -EIO);
 					sec &= ~(sector_t)(ic->sectors_per_block - 1);
 				}
+				if (unlikely(sec >= ic->provided_data_sectors)) {
+					journal_entry_set_unused(je);
+					continue;
+				}
 			}
-			if (unlikely(sec >= ic->provided_data_sectors))
-				continue;
 			get_area_and_offset(ic, sec, &area, &offset);
 			restore_last_bytes(ic, access_journal_data(ic, i, j), je);
 			for (k = j + 1; k < ic->journal_section_entries; k++) {