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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Loic Poulain <loic.poulain@linaro.org>,
        Marcel Holtmann <marcel@holtmann.org>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.14 02/67] Bluetooth: btqcomsmd: Fix skb double
 free corruption
Thread-Topic: [PATCH AUTOSEL for 4.14 02/67] Bluetooth: btqcomsmd: Fix skb
 double free corruption
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Date:   Thu, 8 Mar 2018 04:57:32 +0000
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From: Loic Poulain <loic.poulain@linaro.org>

[ Upstream commit 67b8fbead4685b36d290a0ef91c6ddffc4920ec9 ]

In case of hci send frame failure, skb is still owned
by the caller (hci_core) and then should not be freed.

This fixes crash on dragonboard-410c when sending SCO
packet. skb is freed by both btqcomsmd and hci_core.

Fixes: 1511cc750c3d ("Bluetooth: Introduce Qualcomm WCNSS SMD based HCI dri=
ver")
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/bluetooth/btqcomsmd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btqcomsmd.c b/drivers/bluetooth/btqcomsmd.c
index bd810d01538a..093fd096f0c8 100644
--- a/drivers/bluetooth/btqcomsmd.c
+++ b/drivers/bluetooth/btqcomsmd.c
@@ -86,7 +86,8 @@ static int btqcomsmd_send(struct hci_dev *hdev, struct sk=
_buff *skb)
 		break;
 	}
=20
-	kfree_skb(skb);
+	if (!ret)
+		kfree_skb(skb);
=20
 	return ret;
 }
--=20
2.14.1