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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2014-06-06 00:01:46 -0400
committerSteven Rostedt <rostedt@goodmis.org>2014-06-06 04:53:40 -0400
commit23aaa3c18e33fe048671b419781b5e44175efafe (patch)
tree03a3129a3bf0b04061d2904789a87c668de755c6 /kernel/trace
parent748ec3a20eb44fce19af3cef04f8db8a8e7aead3 (diff)
tracing: Fix leak of ring buffer data when new instances creation fails
Yoshihiro Yunomae reported that the ring buffer data for a trace instance does not get properly cleaned up when it fails. He proposed a patch that manually cleaned the data up and addad a bunch of labels. The labels are not needed because all trace array is allocated with a kzalloc which initializes it to 0 and all kfree()s can take a NULL pointer and will ignore it. Adding a new helper function free_trace_buffers() that can also take null buffers to free the buffers that were allocated by allocate_trace_buffers(). Link: http://lkml.kernel.org/r/20140605223522.32311.31664.stgit@yunodevel Reported-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index e29edee1542..26cfff38e2a 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -6232,6 +6232,25 @@ static int allocate_trace_buffers(struct trace_array *tr, int size)
return 0;
}
+static void free_trace_buffers(struct trace_array *tr)
+{
+ if (!tr)
+ return;
+
+ if (tr->trace_buffer.buffer) {
+ ring_buffer_free(tr->trace_buffer.buffer);
+ tr->trace_buffer.buffer = NULL;
+ free_percpu(tr->trace_buffer.data);
+ }
+
+#ifdef CONFIG_TRACER_MAX_TRACE
+ if (tr->max_buffer.buffer) {
+ ring_buffer_free(tr->max_buffer.buffer);
+ tr->max_buffer.buffer = NULL;
+ }
+#endif
+}
+
static int new_instance_create(const char *name)
{
struct trace_array *tr;
@@ -6290,8 +6309,7 @@ static int new_instance_create(const char *name)
return 0;
out_free_tr:
- if (tr->trace_buffer.buffer)
- ring_buffer_free(tr->trace_buffer.buffer);
+ free_trace_buffers(tr);
free_cpumask_var(tr->tracing_cpumask);
kfree(tr->name);
kfree(tr);