Avoid potential NULL dereference in unregister_sysctl_table

[karo-tx-linux.git] / kernel / sysctl.c

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 0deed82a61568d6660a7f4ee625c490ffecffcc5..8ac51714b08ca7ec4261b8544fc62524dad8a3e4 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1588,6 +1588,10 @@ struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
 void unregister_sysctl_table(struct ctl_table_header * header)
 {
        might_sleep();
+
+       if (header == NULL)
+               return;
+
        spin_lock(&sysctl_lock);
        start_unregistering(header);
        spin_unlock(&sysctl_lock);