From: Parav Pandit <parav@mellanox.com>
Date: Tue, 12 Feb 2019 14:24:08 -0600
Subject: devlink: Fix list access without lock while reading region
Patch-mainline: v5.1-rc1
Git-commit: dac7c08f988bbc7208fc7403a5d75d4bb791139c
References: bsc#1109837

While finding the devlink device during region reading,
devlink device list is accessed and devlink device is
returned without holding a lock. This could lead to use-after-free
accesses.

While at it, add lockdep assert to ensure that all future callers hold
the lock when calling devlink_get_from_attrs().

Fixes: 4e54795a27f5 ("devlink: Add support for region snapshot read command")
Signed-off-by: Parav Pandit <parav@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/core/devlink.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -115,6 +115,8 @@ static struct devlink *devlink_get_from_
 	busname = nla_data(attrs[DEVLINK_ATTR_BUS_NAME]);
 	devname = nla_data(attrs[DEVLINK_ATTR_DEV_NAME]);
 
+	lockdep_assert_held(&devlink_mutex);
+
 	list_for_each_entry(devlink, &devlink_list, list) {
 		if (strcmp(devlink->dev->bus->name, busname) == 0 &&
 		    strcmp(dev_name(devlink->dev), devname) == 0 &&
@@ -3520,13 +3522,13 @@ static int devlink_nl_cmd_region_read_du
 	if (err)
 		goto out;
 
+	mutex_lock(&devlink_mutex);
 	devlink = devlink_get_from_attrs(sock_net(cb->skb->sk), attrs);
 	if (IS_ERR(devlink)) {
 		err = PTR_ERR(devlink);
-		goto out;
+		goto out_dev;
 	}
 
-	mutex_lock(&devlink_mutex);
 	mutex_lock(&devlink->lock);
 
 	if (!attrs[DEVLINK_ATTR_REGION_NAME] ||
@@ -3603,6 +3605,7 @@ nla_put_failure:
 	genlmsg_cancel(skb, hdr);
 out_unlock:
 	mutex_unlock(&devlink->lock);
+out_dev:
 	mutex_unlock(&devlink_mutex);
 out:
 	return err;