1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index 189badbeddaf..3362d866793b 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -594,7 +594,7 @@ static int log_mark(struct log_writes_c *lc, char *data)
                 return -ENOMEM;
         }
 
-        block->data = kstrndup(data, maxsize, GFP_KERNEL);
+        block->data = kstrndup(data, maxsize - 1, GFP_KERNEL);
         if (!block->data) {
                 DMERR("Error copying mark data");
                 kfree(block);