[PATCH v3] thunderbolt: Fix to check the return value of kmemdup

[Aditya Pakki]

uuid in add_switch is allocted via kmemdup which can fail. The patch
logs the error and cleans up the allocated memory for switch.

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

---
v2: replace WARN_ONCE with tb_sw_warn, as suggested by Mika
v1: Change warn_once to return after clean up.
---
 drivers/thunderbolt/icm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/thunderbolt/icm.c b/drivers/thunderbolt/icm.c
index e3fc920af682..8b7f9131e9d1 100644
--- a/drivers/thunderbolt/icm.c
+++ b/drivers/thunderbolt/icm.c
@@ -473,6 +473,11 @@ static void add_switch(struct tb_switch *parent_sw, u64 
route,
                goto out;
 
        sw->uuid = kmemdup(uuid, sizeof(*uuid), GFP_KERNEL);
+       if (!sw->uuid) {
+               tb_sw_warn(sw, "cannot allocate memory for switch\n");
+               tb_switch_put(sw);
+               goto out;
+       }
        sw->connection_id = connection_id;
        sw->connection_key = connection_key;
        sw->link = link;
-- 
2.17.1