diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2020-10-09 14:58:22 +0300 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2020-10-30 12:03:59 +0300 |
| commit | 9bdaf3b91efd229dd272b228e13df10310c80d19 (patch) | |
| tree | cce51892def0ea5e22ea5631ed5f3679aa03519d /net/wireless/nl80211.c | |
| parent | 14f46c1e5108696ec1e5a129e838ecedf108c7bf (diff) | |
| download | linux-9bdaf3b91efd229dd272b228e13df10310c80d19.tar.xz | |
cfg80211: initialize wdev data earlier
There's a race condition in the netdev registration in that
NETDEV_REGISTER actually happens after the netdev is available,
and so if we initialize things only there, we might get called
with an uninitialized wdev through nl80211 - not using a wdev
but using a netdev interface index.
I found this while looking into a syzbot report, but it doesn't
really seem to be related, and unfortunately there's no repro
for it (yet). I can't (yet) explain how it managed to get into
cfg80211_release_pmsr() from nl80211_netlink_notify() without
the wdev having been initialized, as the latter only iterates
the wdevs that are linked into the rdev, which even without the
change here happened after init.
However, looking at this, it seems fairly clear that the init
needs to be done earlier, otherwise we might even re-init on a
netns move, when data might still be pending.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20201009135821.fdcbba3aad65.Ie9201d91dbcb7da32318812effdc1561aeaf4cdc@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless/nl80211.c')
| -rw-r--r-- | net/wireless/nl80211.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 554796a6c6fe..a77174b99b07 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -3885,7 +3885,8 @@ static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info) * P2P Device and NAN do not have a netdev, so don't go * through the netdev notifier and must be added here */ - cfg80211_init_wdev(rdev, wdev); + cfg80211_init_wdev(wdev); + cfg80211_register_wdev(rdev, wdev); break; default: break; |