linux-kernel - [PATCH] appletalk: prevent unregister_sysctl

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Date:	Tue, 24 Oct 2006 17:53:57 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...l.org, Arnaldo Carvalho de Melo <acme@...ectiva.com.br>
Subject: [PATCH] appletalk: prevent unregister_sysctl_table() with a NULL argument

If register_sysctl_table() fails during module initalization,
NULL pointer dereference will happen in the module cleanup.

Cc: Arnaldo Carvalho de Melo <acme@...ectiva.com.br>
Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>

 net/appletalk/sysctl_net_atalk.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: work-fault-inject/net/appletalk/sysctl_net_atalk.c
===================================================================
--- work-fault-inject.orig/net/appletalk/sysctl_net_atalk.c
+++ work-fault-inject/net/appletalk/sysctl_net_atalk.c
@@ -78,5 +78,6 @@ void atalk_register_sysctl(void)
 
 void atalk_unregister_sysctl(void)
 {
-	unregister_sysctl_table(atalk_table_header);
+	if (atalk_table_header)
+		unregister_sysctl_table(atalk_table_header);
 }
-
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