From: Johannes Berg johannes.berg@intel.com
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
--- net/mac80211/debugfs_netdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/mac80211/debugfs_netdev.c +++ b/net/mac80211/debugfs_netdev.c @@ -841,7 +841,7 @@ void ieee80211_debugfs_rename_netdev(str
dir = sdata->vif.debugfs_dir;
- if (!dir) + if (IS_ERR_OR_NULL(dir)) return;
sprintf(buf, "netdev:%s", sdata->name);