linux-kernel - [PATCH v2] thunderbolt: Fix to check return value of ida_simple

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Message-Id: <20190320162446.30500-1-pakki001@umn.edu>
Date:   Wed, 20 Mar 2019 11:24:45 -0500
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] thunderbolt: Fix to check return value of ida_simple_get

In enumerate_services, ida_simple_get on failure can return an error and
leaks memory during device_register failure. The patch ensures that
the dev_set_name is set on non failure cases, and releases memory in
case of failure.

Signed-off-by: Aditya Pakki <pakki001@....edu>

---
v1: Missed cleanup of svc in case of allocation failure and
device_register failure.
---
 drivers/thunderbolt/xdomain.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c
index e27dd8beb94b..eb08275185bf 100644
--- a/drivers/thunderbolt/xdomain.c
+++ b/drivers/thunderbolt/xdomain.c
@@ -740,6 +740,7 @@ static void enumerate_services(struct tb_xdomain *xd)
 	struct tb_service *svc;
 	struct tb_property *p;
 	struct device *dev;
+	int id;
 
 	/*
 	 * First remove all services that are not available anymore in
@@ -768,7 +769,12 @@ static void enumerate_services(struct tb_xdomain *xd)
 			break;
 		}
 
-		svc->id = ida_simple_get(&xd->service_ids, 0, 0, GFP_KERNEL);
+		id = ida_simple_get(&xd->service_ids, 0, 0, GFP_KERNEL);
+		if (id < 0) {
+			kfree(svc);
+			break;
+		}
+		svc->id = id;
 		svc->dev.bus = &tb_bus_type;
 		svc->dev.type = &tb_service_type;
 		svc->dev.parent = &xd->dev;
@@ -776,6 +782,7 @@ static void enumerate_services(struct tb_xdomain *xd)
 
 		if (device_register(&svc->dev)) {
 			put_device(&svc->dev);
+			kfree(svc);
 			break;
 		}
 	}
-- 
2.17.1