1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index a2e69d26266d..a01d7f68fc77 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -622,6 +622,11 @@ static int __init null_init(void)
                 irqmode = NULL_IRQ_NONE;
         }
 #endif
+        if (bs > PAGE_SIZE) {
+                pr_warn("null_blk: invalid block size\n");
+                pr_warn("null_blk: defaults block size to %lu\n", PAGE_SIZE);
+                bs = PAGE_SIZE;
+        }
 
         if (queue_mode == NULL_Q_MQ && use_per_node_hctx) {
                 if (submit_queues < nr_online_nodes) {