From: Parav Pandit <parav@mellanox.com>
To: jiri@mellanox.com, davem@davemloft.net, netdev@vger.kernel.org
Cc: parav@mellanox.com
Subject: [PATCH net-next 2/2] devlink: Fix list access without lock while reading region
Date: Tue, 12 Feb 2019 01:09:37 -0600 [thread overview]
Message-ID: <1549955377-15828-1-git-send-email-parav@mellanox.com> (raw)
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 user-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>
---
net/core/devlink.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 8a198ba..8cd773b 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -116,6 +116,8 @@ static struct devlink *devlink_get_from_attrs(struct net *net,
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 &&
@@ -3642,13 +3644,13 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
if (err)
goto out;
+ mutex_lock(&devlink_mutex);
devlink = devlink_get_from_attrs(sock_net(cb->skb->sk), attrs);
if (IS_ERR(devlink)) {
err = -ENODEV;
- goto out;
+ goto out_dev;
}
- mutex_lock(&devlink_mutex);
mutex_lock(&devlink->lock);
if (!attrs[DEVLINK_ATTR_REGION_NAME] ||
@@ -3723,6 +3725,7 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
genlmsg_cancel(skb, hdr);
out_unlock:
mutex_unlock(&devlink->lock);
+out_dev:
mutex_unlock(&devlink_mutex);
out:
return err;
--
1.8.3.1
next reply other threads:[~2019-02-12 7:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-12 7:09 Parav Pandit [this message]
2019-02-12 9:01 ` [PATCH net-next 2/2] devlink: Fix list access without lock while reading region Sergei Shtylyov
2019-02-12 16:04 ` Parav Pandit
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