mac80211: don't attempt to rename ERR_PTR() debugfs dirs

BugLink: https://bugs.launchpad.net/bugs/1838459
commit 517879147493a5e1df6b89a50f708f1133fcaddb upstream.

We need to dereference the directory to get its parent to
be able to rename it, so it's clearly not safe to try to
do this with ERR_PTR() pointers. Skip in this case.

It seems that this is most likely what was causing the
report by syzbot, but I'm not entirely sure as it didn't
come with a reproducer this time.

Cc: stable@vger.kernel.org
Reported-by: syzbot+4ece1a28b8f4730547c9@syzkaller.appspotmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index c813207bb123652105972f743a3c4499134f9319..d37d4acafebf54f5bd47f8f642f6fa8956c54ec5 100644 (file)
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -838,7 +838,7 @@ void ieee80211_debugfs_rename_netdev(struct ieee80211_sub_if_data *sdata)
 
        dir = sdata->vif.debugfs_dir;
 
-       if (!dir)
+       if (IS_ERR_OR_NULL(dir))
                return;
 
        sprintf(buf, "netdev:%s", sdata->name);