netdev - [PATCH net-next 2/4] devlink: don't allocate attrs on the stack

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Date:   Fri,  8 Feb 2019 19:16:09 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     davem@...emloft.net
Cc:     jiri@...nulli.us, netdev@...r.kernel.org,
        oss-drivers@...ronome.com,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH net-next 2/4] devlink: don't allocate attrs on the stack

Number of devlink attributes has grown over 128, causing the
following warning:

../net/core/devlink.c: In function ‘devlink_nl_cmd_region_read_dumpit’:
../net/core/devlink.c:3740:1: warning: the frame size of 1064 bytes is larger than 1024 bytes [-Wframe-larger-than=]
 }
  ^

Since the number of attributes is only going to grow allocate
the array dynamically.

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
---
 net/core/devlink.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index cf0f511bc56c..46c468a1f3dc 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -3629,26 +3629,30 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
 					     struct netlink_callback *cb)
 {
 	u64 ret_offset, start_offset, end_offset = 0;
-	struct nlattr *attrs[DEVLINK_ATTR_MAX + 1];
 	const struct genl_ops *ops = cb->data;
 	struct devlink_region *region;
 	struct nlattr *chunks_attr;
 	const char *region_name;
 	struct devlink *devlink;
+	struct nlattr **attrs;
 	bool dump = true;
 	void *hdr;
 	int err;
 
 	start_offset = *((u64 *)&cb->args[0]);
 
+	attrs = kmalloc_array(DEVLINK_ATTR_MAX + 1, sizeof(*attrs), GFP_KERNEL);
+	if (!attrs)
+		return -ENOMEM;
+
 	err = nlmsg_parse(cb->nlh, GENL_HDRLEN + devlink_nl_family.hdrsize,
 			  attrs, DEVLINK_ATTR_MAX, ops->policy, cb->extack);
 	if (err)
-		goto out;
+		goto out_free;
 
 	devlink = devlink_get_from_attrs(sock_net(cb->skb->sk), attrs);
 	if (IS_ERR(devlink))
-		goto out;
+		goto out_free;
 
 	mutex_lock(&devlink_mutex);
 	mutex_lock(&devlink->lock);
@@ -3710,6 +3714,7 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
 	genlmsg_end(skb, hdr);
 	mutex_unlock(&devlink->lock);
 	mutex_unlock(&devlink_mutex);
+	kfree(attrs);
 
 	return skb->len;
 
@@ -3718,7 +3723,8 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
 out_unlock:
 	mutex_unlock(&devlink->lock);
 	mutex_unlock(&devlink_mutex);
-out:
+out_free:
+	kfree(attrs);
 	return 0;
 }
 
-- 
2.19.2