linux-kernel - [PATCH 4.9 095/199] appletalk: Set error code if register_snap

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Message-Id: <20191219183220.178908810@linuxfoundation.org>
Date:   Thu, 19 Dec 2019 19:32:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, YueHaibing <yuehaibing@...wei.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.9 095/199] appletalk: Set error code if register_snap_client failed

From: YueHaibing <yuehaibing@...wei.com>

commit c93ad1337ad06a718890a89cdd85188ff9a5a5cc upstream.

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/appletalk/ddp.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -1927,6 +1927,7 @@ 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;
 	}