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null_blk: validate the number of devices

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A negative number of devices is nonsensical, so change the type to
unsigned. If the number of devices is 0, it is impossible for userspace
to interact with the module, so refuse loading the driver for that case.

Signed-off-by: André Almeida <andrealmeid@collabora.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
André Almeida 2019-09-11 11:46:36 -03:00 committed by Jens Axboe
parent 4e47ee8fbe
commit f7c4ce890d
1 changed files with 5 additions and 1 deletions
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6
drivers/block/null_blk_main.c
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@ -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",