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Message-Id: <20210628143628.33342-74-sashal@kernel.org>
Date: Mon, 28 Jun 2021 10:36:13 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Du Cheng <ducheng2@...il.com>,
syzbot+105896fac213f26056f9@...kaller.appspotmail.com,
Johannes Berg <johannes.berg@...el.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 73/88] cfg80211: call cfg80211_leave_ocb when switching away from OCB
From: Du Cheng <ducheng2@...il.com>
[ Upstream commit a64b6a25dd9f984ed05fade603a00e2eae787d2f ]
If the userland switches back-and-forth between NL80211_IFTYPE_OCB and
NL80211_IFTYPE_ADHOC via send_msg(NL80211_CMD_SET_INTERFACE), there is a
chance where the cleanup cfg80211_leave_ocb() is not called. This leads
to initialization of in-use memory (e.g. init u.ibss while in-use by
u.ocb) due to a shared struct/union within ieee80211_sub_if_data:
struct ieee80211_sub_if_data {
...
union {
struct ieee80211_if_ap ap;
struct ieee80211_if_vlan vlan;
struct ieee80211_if_managed mgd;
struct ieee80211_if_ibss ibss; // <- shares address
struct ieee80211_if_mesh mesh;
struct ieee80211_if_ocb ocb; // <- shares address
struct ieee80211_if_mntr mntr;
struct ieee80211_if_nan nan;
} u;
...
}
Therefore add handling of otype == NL80211_IFTYPE_OCB, during
cfg80211_change_iface() to perform cleanup when leaving OCB mode.
link to syzkaller bug:
https://syzkaller.appspot.com/bug?id=0612dbfa595bf4b9b680ff7b4948257b8e3732d5
Reported-by: syzbot+105896fac213f26056f9@...kaller.appspotmail.com
Signed-off-by: Du Cheng <ducheng2@...il.com>
Link: https://lore.kernel.org/r/20210428063941.105161-1-ducheng2@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
net/wireless/util.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/wireless/util.c b/net/wireless/util.c
index b3895a8a48ab..bf4dd297a4db 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -1041,6 +1041,9 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
case NL80211_IFTYPE_MESH_POINT:
/* mesh should be handled? */
break;
+ case NL80211_IFTYPE_OCB:
+ cfg80211_leave_ocb(rdev, dev);
+ break;
default:
break;
}
--
2.30.2
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