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

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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>
This commit is contained in:
Johannes Berg 2019-04-15 11:39:33 +02:00
parent 8772eed9a9
commit 5178791474
1 changed files with 1 additions and 1 deletions
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2
net/mac80211/debugfs_netdev.c
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@ -841,7 +841,7 @@ 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);