null_blk: Null pointer deference problem in alloc_page_buffers

[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / block / null_blk.c

diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index a2e69d2..a01d7f6 100644 (file)
--- 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) {