rcu: trace fix possible mem-leak

In the initialization of the RCU trace module, if
rcupreempt_debugfs_init() fails, we never free the the trace buffer.

This patch frees the trace buffer in case the debugfs fails.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Reviewed-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 6 insertions, 1 deletions

diff --git a/kernel/rcupreempt_trace.c b/kernel/rcupreempt_trace.c
index 5edf82c34bbc..35c2d3360ecf 100644
--- a/kernel/rcupreempt_trace.c
+++ b/kernel/rcupreempt_trace.c
@@ -308,11 +308,16 @@ out:
 
 static int __init rcupreempt_trace_init(void)
 {
+        int ret;
+
         mutex_init(&rcupreempt_trace_mutex);
         rcupreempt_trace_buf = kmalloc(RCUPREEMPT_TRACE_BUF_SIZE, GFP_KERNEL);
         if (!rcupreempt_trace_buf)
                 return 1;
-        return rcupreempt_debugfs_init();
+        ret = rcupreempt_debugfs_init();
+        if (ret)
+                kfree(rcupreempt_trace_buf);
+        return ret;
 }
 
 static void __exit rcupreempt_trace_cleanup(void)