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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2014-06-06 00:01:46 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-06-06 04:53:40 -0400 |
| commit | 23aaa3c18e33fe048671b419781b5e44175efafe (patch) | |
| tree | 03a3129a3bf0b04061d2904789a87c668de755c6 | |
| parent | 748ec3a20eb44fce19af3cef04f8db8a8e7aead3 (diff) | |
| download | linux-23aaa3c18e33fe048671b419781b5e44175efafe.tar.gz | |
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>
| -rw-r--r-- | kernel/trace/trace.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index e29edee1542a..26cfff38e2ab 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); |