[PATCH] appletalk: prevent unregister_sysctl_table() with a NULL argument

[Akinobu Mita]

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

Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxxxxxx>
Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>

 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);
 }
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/