This is a note to let you know that I've just added the patch titled
nl80211: fix locking in nl80211_set_tx_bitrate_mask()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nl80211-fix-locking-in-nl80211_set_tx_bitrate_mask.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 01ff0fd1c5cc66cd11be4afd8f5edd8537d0911a
Author: Johannes Berg <johannes.berg@xxxxxxxxx>
Date: Fri May 6 10:21:38 2022 +0200
nl80211: fix locking in nl80211_set_tx_bitrate_mask()
[ Upstream commit f971e1887fdb3ab500c9bebf4b98f62d49a20655 ]
This accesses the wdev's chandef etc., so cannot safely
be used without holding the lock.
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220506102136.06b7205419e6.I2a87c05fbd8bc5e565e84d190d4cfd2e92695a90@changeid
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 9fae09e860e1..7c65ad17bf50 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -11341,18 +11341,23 @@ static int nl80211_set_tx_bitrate_mask(struct sk_buff *skb,
struct cfg80211_bitrate_mask mask;
struct cfg80211_registered_device *rdev = info->user_ptr[0];
struct net_device *dev = info->user_ptr[1];
+ struct wireless_dev *wdev = dev->ieee80211_ptr;
int err;
if (!rdev->ops->set_bitrate_mask)
return -EOPNOTSUPP;
+ wdev_lock(wdev);
err = nl80211_parse_tx_bitrate_mask(info, info->attrs,
NL80211_ATTR_TX_RATES, &mask,
dev, true);
if (err)
- return err;
+ goto out;
- return rdev_set_bitrate_mask(rdev, dev, NULL, &mask);
+ err = rdev_set_bitrate_mask(rdev, dev, NULL, &mask);
+out:
+ wdev_unlock(wdev);
+ return err;
}
static int nl80211_register_mgmt(struct sk_buff *skb, struct genl_info *info)
