From: Sudha Bheemanna <b.sudha@samsung.com>
Date: Mon, 12 Sep 2016 06:27:38 +0000 (+0530)
Subject: Bluetooth: check sock parent before unlink
X-Git-Tag: submit/tizen/20161216.052309~144
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ecf6bb40876e428006439547c75e55555bb8eaf9;p=platform%2Fkernel%2Flinux-exynos.git

Bluetooth: check sock parent before unlink

Add a check for BT socket before using it to unlink
in bt_accept_unlink(). This helps to avoid kernel panic.

Change-Id: Ie8919dedce239a3476c06ad48ebb3a0f731b9856
Signed-off-by: Sudha Bheemanna <b.sudha@samsung.com>
[update patch title]
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
---

diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index 70f9d945faf7..525ad0f1239d 100644
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -189,12 +189,18 @@ struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
 		/* FIXME: Is this check still needed */
 		if (sk->sk_state == BT_CLOSED) {
 			release_sock(sk);
+#ifdef TIZEN_BT
+			if (bt_sk(sk)->parent)
+#endif
 			bt_accept_unlink(sk);
 			continue;
 		}
 
 		if (sk->sk_state == BT_CONNECTED || !newsock ||
 		    test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags)) {
+#ifdef TIZEN_BT
+			if (bt_sk(sk)->parent)
+#endif
 			bt_accept_unlink(sk);
 			if (newsock)
 				sock_graft(sk, newsock);