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Message-Id: <20210706112203.2062605-126-sashal@kernel.org>
Date: Tue, 6 Jul 2021 07:21:52 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
Dan Carpenter <dan.carpenter@...cle.com>,
Marcel Holtmann <marcel@...tmann.org>,
Sasha Levin <sashal@...nel.org>,
linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.10 126/137] Bluetooth: L2CAP: Fix invalid access if ECRED Reconfigure fails
From: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
[ Upstream commit 1fa20d7d4aad02206e84b74915819fbe9f81dab3 ]
The use of l2cap_chan_del is not safe under a loop using
list_for_each_entry.
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
net/bluetooth/l2cap_core.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index cdc386337173..17520133093a 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -6237,7 +6237,7 @@ static inline int l2cap_ecred_reconf_rsp(struct l2cap_conn *conn,
struct l2cap_cmd_hdr *cmd, u16 cmd_len,
u8 *data)
{
- struct l2cap_chan *chan;
+ struct l2cap_chan *chan, *tmp;
struct l2cap_ecred_conn_rsp *rsp = (void *) data;
u16 result;
@@ -6251,7 +6251,7 @@ static inline int l2cap_ecred_reconf_rsp(struct l2cap_conn *conn,
if (!result)
return 0;
- list_for_each_entry(chan, &conn->chan_l, list) {
+ list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
if (chan->ident != cmd->ident)
continue;
--
2.30.2
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