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Message-ID: <20240625024819.26299-2-yskelg@gmail.com>
Date: Tue, 25 Jun 2024 11:48:20 +0900
From: yskelg@...il.com
To: Alexandra Winter <wintera@...ux.ibm.com>,
Thorsten Winkler <twinkler@...ux.ibm.com>,
Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
Markus Elfring <Markus.Elfring@....de>
Cc: MichelleJin <shjy180909@...il.com>,
linux-s390@...r.kernel.org,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
Yunseong Kim <yskelg@...il.com>
Subject: [PATCH v2] s390/netiucv: handle memory allocation failure in conn_action_start()
From: Yunseong Kim <yskelg@...il.com>
A null pointer is stored in the data structure member "path" after a call
of the function "iucv_path_alloc" failed. This pointer was passed to
a subsequent call of the function "iucv_path_connect" where an undesirable
dereference will be performed then. Thus add a corresponding return value
check. This prevent null pointer dereferenced kernel panic when memory
exhausted situation with the netiucv driver operating as an FSM state
in "conn_action_start".
Fixes: eebce3856737 ("[S390]: Adapt netiucv driver to new IUCV API")
Cc: linux-s390@...r.kernel.org
Signed-off-by: Yunseong Kim <yskelg@...il.com>
---
drivers/s390/net/netiucv.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/s390/net/netiucv.c b/drivers/s390/net/netiucv.c
index 039e18d46f76..d3ae78c0240f 100644
--- a/drivers/s390/net/netiucv.c
+++ b/drivers/s390/net/netiucv.c
@@ -855,6 +855,9 @@ static void conn_action_start(fsm_instance *fi, int event, void *arg)
fsm_newstate(fi, CONN_STATE_SETUPWAIT);
conn->path = iucv_path_alloc(NETIUCV_QUEUELEN_DEFAULT, 0, GFP_KERNEL);
+ if (!conn->path)
+ return;
+
IUCV_DBF_TEXT_(setup, 2, "%s: connecting to %s ...\n",
netdev->name, netiucv_printuser(conn));
--
2.45.2
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