linux-kernel - [PATCH 4.9 135/177] Bluetooth: btqcomsmd: Fix skb double free corruption

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Message-Id: <20180323094211.166951345@linuxfoundation.org>
Date:   Fri, 23 Mar 2018 10:54:23 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Loic Poulain <loic.poulain@...aro.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 135/177] Bluetooth: btqcomsmd: Fix skb double free corruption

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Loic Poulain <loic.poulain@...aro.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 driver")
Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/bluetooth/btqcomsmd.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/bluetooth/btqcomsmd.c
+++ b/drivers/bluetooth/btqcomsmd.c
@@ -85,7 +85,8 @@ static int btqcomsmd_send(struct hci_dev
 		break;
 	}
 
-	kfree_skb(skb);
+	if (!ret)
+		kfree_skb(skb);
 
 	return ret;
 }