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tracing/histogram: Fix a potential memory leak for kstrdup()

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commit e629e7b525 upstream.

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).

Link: https://lkml.kernel.org/r/tencent_C52895FD37802832A3E5B272D05008866F0A@qq.com

Cc: stable@vger.kernel.org
Fixes: d380dcde9a ("tracing: Fix now invalid var_ref_vals assumption in trace action")
Signed-off-by: Xiaoke Wang <xkernel.wang@foxmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xiaoke Wang 2022-01-25 12:07:15 +08:00 committed by Greg Kroah-Hartman
parent 561a22d44a
commit d71b06aa99
1 changed files with 1 additions and 0 deletions
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1
kernel/trace/trace_events_hist.c
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@ -3506,6 +3506,7 @@ static int trace_action_create(struct hist_trigger_data *hist_data,
var_ref_idx = find_var_ref_idx(hist_data, var_ref); var_ref_idx = find_var_ref_idx(hist_data, var_ref);
if (WARN_ON(var_ref_idx < 0)) { if (WARN_ON(var_ref_idx < 0)) {
kfree(p);
ret = var_ref_idx; ret = var_ref_idx;
goto err; goto err;
} }