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path: root/drivers/block/null_blk_main.c
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Diffstat (limited to 'drivers/block/null_blk_main.c')
-rw-r--r--drivers/block/null_blk_main.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c
index bd6e5cd02a57..53d4c1529984 100644
--- a/drivers/block/null_blk_main.c
+++ b/drivers/block/null_blk_main.c
@@ -141,7 +141,7 @@ static int g_bs = 512;
module_param_named(bs, g_bs, int, 0444);
MODULE_PARM_DESC(bs, "Block size (in bytes)");
-static int nr_devices = 1;
+static unsigned int nr_devices = 1;
module_param(nr_devices, int, 0444);
MODULE_PARM_DESC(nr_devices, "Number of devices to register");
@@ -1767,6 +1767,10 @@ static int __init null_init(void)
pr_err("null_blk: legacy IO path no longer available\n");
return -EINVAL;
}
+ if (!nr_devices) {
+ pr_err("null_blk: invalid number of devices\n");
+ return -EINVAL;
+ }
if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) {
if (g_submit_queues != nr_online_nodes) {
pr_warn("null_blk: submit_queues param is set to %u.\n",