[PATCH] tracing/histogram: fix a potential memory leak for kstrdup()

[xkernel . wang]

From: Xiaoke Wang <xkernel.wang@xxxxxxxxxxx>

kfree() is missing on an error path to free the memory allocated by
kstrdup():
> p = param = kstrdup(data->params[i], GFP_KERNEL);
So it is better to free it via kfree(p).

Signed-off-by: Xiaoke Wang <xkernel.wang@xxxxxxxxxxx>
---
 kernel/trace/trace_events_hist.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index f01e442..1fac14c 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -3578,6 +3578,7 @@ static int trace_action_create(struct hist_trigger_data *hist_data,
 
 			var_ref_idx = find_var_ref_idx(hist_data, var_ref);
 			if (WARN_ON(var_ref_idx < 0)) {
+				kfree(p);
 				ret = var_ref_idx;
 				goto err;
 			}
--