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nbd: fix crash when the blksize is zero 

This will allow the blksize to be set zero and then use 1024 as
default.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Xiubo Li <xiubli@redhat.com>
[fix to use goto out instead of return in genl_connect]
Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Xiubo Li 2019-05-29 15:16:05 -05:00 committed by Jens Axboe
parent b49773e7bc
commit 553768d116
1 changed files with 20 additions and 3 deletions
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23
drivers/block/nbd.c
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@ -134,6 +134,8 @@ static struct dentry *nbd_dbg_dir;
#define NBD_MAGIC 0x68797548
#define NBD_DEF_BLKSIZE 1024
static unsigned int nbds_max = 16;
static int max_part = 16;
static struct workqueue_struct *recv_workqueue;
@ -1236,6 +1238,14 @@ static void nbd_clear_sock_ioctl(struct nbd_device *nbd,
nbd_config_put(nbd);
}
static bool nbd_is_valid_blksize(unsigned long blksize)
{
if (!blksize || !is_power_of_2(blksize) || blksize < 512 ||
blksize > PAGE_SIZE)
return false;
return true;
}
/* Must be called with config_lock held */
static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
unsigned int cmd, unsigned long arg)
@ -1251,8 +1261,9 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
case NBD_SET_SOCK:
return nbd_add_socket(nbd, arg, false);
case NBD_SET_BLKSIZE:
if (!arg || !is_power_of_2(arg) || arg < 512 ||
arg > PAGE_SIZE)
if (!arg)
arg = NBD_DEF_BLKSIZE;
if (!nbd_is_valid_blksize(arg))
return -EINVAL;
nbd_size_set(nbd, arg,
div_s64(config->bytesize, arg));
@ -1332,7 +1343,7 @@ static struct nbd_config *nbd_alloc_config(void)
atomic_set(&config->recv_threads, 0);
init_waitqueue_head(&config->recv_wq);
init_waitqueue_head(&config->conn_wait);
config->blksize = 1024;
config->blksize = NBD_DEF_BLKSIZE;
atomic_set(&config->live_connections, 0);
try_module_get(THIS_MODULE);
return config;
@ -1768,6 +1779,12 @@ again:
if (info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]) {
u64 bsize =
nla_get_u64(info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]);
if (!bsize)
bsize = NBD_DEF_BLKSIZE;
if (!nbd_is_valid_blksize(bsize)) {
ret = -EINVAL;
goto out;
}
nbd_size_set(nbd, bsize, div64_u64(config->bytesize, bsize));
}
if (info->attrs[NBD_ATTR_TIMEOUT]) {