kernel/smp.c: free related resources when failure occurs in hotplug_cfd()

When failure occurs in hotplug_cfd(), need release related resources, or
will cause memory leak.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Acked-by: Wang YanQing <udknight@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/smp.c b/kernel/smp.c
index 449b707..3bb6ae5 100644 (file)
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -48,10 +48,13 @@ hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu)
                                cpu_to_node(cpu)))
                        return notifier_from_errno(-ENOMEM);
                if (!zalloc_cpumask_var_node(&cfd->cpumask_ipi, GFP_KERNEL,
-                               cpu_to_node(cpu)))
+                               cpu_to_node(cpu))) {
+                       free_cpumask_var(cfd->cpumask);
                        return notifier_from_errno(-ENOMEM);
+               }
                cfd->csd = alloc_percpu(struct call_single_data);
                if (!cfd->csd) {
+                       free_cpumask_var(cfd->cpumask_ipi);
                        free_cpumask_var(cfd->cpumask);
                        return notifier_from_errno(-ENOMEM);
                }