linux-kernel - [PATCH AUTOSEL for 4.14 020/135] thunderbolt: tb: fix use after free in tb_activate_pcie

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Date:   Thu, 7 Dec 2017 15:45:34 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.14 020/135] thunderbolt: tb: fix use after free
 in tb_activate_pcie_devices

From: "Gustavo A. R. Silva" <garsilva@...eddedor.com>

[ Upstream commit a2e373438f72391493a4425efc1b82030b6b4fd5 ]

Add a ̣̣continue statement in order to avoid using a previously
free'd pointer tunnel in list_add.

Addresses-Coverity-ID: 1415336
Fixes: 9d3cce0b6136 ("thunderbolt: Introduce thunderbolt bus and connection manager")
Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/thunderbolt/tb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index d674e06767a5..1424581fd9af 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -225,6 +225,7 @@ static void tb_activate_pcie_devices(struct tb *tb)
 			tb_port_info(up_port,
 				     "PCIe tunnel activation failed, aborting\n");
 			tb_pci_free(tunnel);
+			continue;
 		}
 
 		list_add(&tunnel->list, &tcm->tunnel_list);
-- 
2.11.0