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| author |   André Almeida <andrealmeid@collabora.com> | 2019-09-11 11:46:36 -0300 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2019-09-11 16:04:25 -0600 |
| commit | f7c4ce890dd23f2d41ad9630263aad6e9720af58 (patch) | |
| tree | 342c22408ea5245be96bf4c4461d74555c90ea09 | |
| parent | null_blk: fix module name at log message (diff) | |
| download | wireguard-linux-f7c4ce890dd23f2d41ad9630263aad6e9720af58.tar.xz wireguard-linux-f7c4ce890dd23f2d41ad9630263aad6e9720af58.zip | |
null_blk: validate the number of devices
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>
| -rw-r--r-- | drivers/block/null_blk_main.c | 6 |
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", |