From 553768d1169a48c0cd87c4eb4ab57534ee663415 Mon Sep 17 00:00:00 2001
From: Xiubo Li <xiubli@redhat.com>
Date: Wed, 29 May 2019 15:16:05 -0500
Subject: [PATCH] nbd: fix crash when the blksize is zero
Git-commit: 553768d1169a48c0cd87c4eb4ab57534ee663415
Patch-mainline: v5.3-rc1
References: git-fixes
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>
Signed-off-by: Coly Li <colyli@suse.de>
---
drivers/block/nbd.c | 23 ++++++++++++++++++++---
1 file changed, 20 insertions(+), 3 deletions(-)
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 3a9bca3aa093..5c4e3f2160bf 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -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 @@ static int nbd_genl_connect(struct sk_buff *skb, struct genl_info *info)
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]) {
--
2.35.3