linux-kernel - [PATCH] appletalk: Set error code while register_snap

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Message-ID: <20190430112840.43452-1-yuehaibing@huawei.com>
Date:   Tue, 30 Apr 2019 19:28:40 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <davem@...emloft.net>, <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH] appletalk: Set error code while register_snap_client

If register_snap_client fails in atalk_init,
error code should be set, otherwise it will
triggers NULL pointer dereference while unloading
module.

Fixes: 9804501fa122 ("appletalk: Fix potential NULL pointer dereference in unregister_snap_client")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 net/appletalk/ddp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index 709d254..dbe8b19 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -1920,6 +1920,7 @@ static int __init atalk_init(void)
 	ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
 	if (!ddp_dl) {
 		pr_crit("Unable to register DDP with SNAP.\n");
+		rc = -ENOMEM;
 		goto out_sock;
 	}
 
-- 
2.7.0