* [PATCH] tracing/histogram: fix a potential memory leak for kstrdup()
@ 2022-01-25 4:07 xkernel.wang
2022-01-25 14:32 ` Steven Rostedt
0 siblings, 1 reply; 2+ messages in thread
From: xkernel.wang @ 2022-01-25 4:07 UTC (permalink / raw)
To: rostedt, mingo; +Cc: linux-kernel, Xiaoke Wang
From: Xiaoke Wang <xkernel.wang@foxmail.com>
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@foxmail.com>
---
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;
}
--
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] tracing/histogram: fix a potential memory leak for kstrdup()
2022-01-25 4:07 [PATCH] tracing/histogram: fix a potential memory leak for kstrdup() xkernel.wang
@ 2022-01-25 14:32 ` Steven Rostedt
0 siblings, 0 replies; 2+ messages in thread
From: Steven Rostedt @ 2022-01-25 14:32 UTC (permalink / raw)
To: xkernel.wang; +Cc: mingo, linux-kernel
On Tue, 25 Jan 2022 12:07:15 +0800
xkernel.wang@foxmail.com wrote:
> From: Xiaoke Wang <xkernel.wang@foxmail.com>
>
> 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).
>
Applied. Thanks,
-- Steve
> Signed-off-by: Xiaoke Wang <xkernel.wang@foxmail.com>
> ---
> 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;
> }
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-01-25 14:32 ` Steven Rostedt
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