linux-kernel - [PATCH 5.10 026/199] dm integrity: fix a crash if "recalculate" used without "internal

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Date:   Mon, 25 Jan 2021 19:37:28 +0100
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>,
        Mike Snitzer <snitzer@...hat.com>
Subject: [PATCH 5.10 026/199] dm integrity: fix a crash if "recalculate" used without "internal_hash"

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

commit 2d06dfecb132a1cc2e374a44eae83b5c4356b8b4 upstream.

Recalculate can only be specified with internal_hash.

Cc: stable@...r.kernel.org # v4.19+
Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/dm-integrity.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -4235,6 +4235,12 @@ try_smaller_buffer:
 			r = -ENOMEM;
 			goto bad;
 		}
+	} else {
+		if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
+			ti->error = "Recalculate can only be specified with internal_hash";
+			r = -EINVAL;
+			goto bad;
+		}
 	}
 
 	ic->bufio = dm_bufio_client_create(ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev,