linux-kernel - [PATCH] net: strparser: fix a missing check for create_singlethread

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Message-Id: <20190315041208.32432-1-kjlu@umn.edu>
Date:   Thu, 14 Mar 2019 23:12:06 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, "David S. Miller" <davem@...emloft.net>,
        Doron Roberts-Kedes <doronrk@...com>,
        Vakul Garg <vakul.garg@....com>,
        Dave Watson <davejwatson@...com>,
        YueHaibing <yuehaibing@...wei.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: strparser: fix a missing check for create_singlethread_workqueue

In case create_singlethread_workqueue fails, the check returns
an error to callers to avoid potential NULL pointer dereferences.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 net/strparser/strparser.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/strparser/strparser.c b/net/strparser/strparser.c
index da1a676860ca..860dcfb95ee4 100644
--- a/net/strparser/strparser.c
+++ b/net/strparser/strparser.c
@@ -550,6 +550,8 @@ EXPORT_SYMBOL_GPL(strp_check_rcv);
 static int __init strp_mod_init(void)
 {
 	strp_wq = create_singlethread_workqueue("kstrp");
+	if (unlikely(!strp_wq))
+		return -ENOMEM;
 
 	return 0;
 }
-- 
2.17.1