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tracing: Fix memory leaks in create_field_var()

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The function create_field_var() allocates memory for 'val' through
create_hist_field() inside parse_atom(), and for 'var' through
create_var(), which in turn allocates var->type and var->var.name
internally. Simply calling kfree() to release these structures will
result in memory leaks.

Use destroy_hist_field() to properly free 'val', and explicitly release
the memory of var->type and var->var.name before freeing 'var' itself.

Link: https://patch.msgid.link/20251106120132.3639920-1-zilin@seu.edu.cn
Fixes: 02205a6752 ("tracing: Add support for 'field variables'")
Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Zilin Guan 2025-11-06 12:01:32 +00:00 committed by Steven Rostedt (Google)
parent aa997d2d2a
commit 80f0d631dc
1 changed files with 4 additions and 2 deletions
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6
kernel/trace/trace_events_hist.c
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@ -3272,14 +3272,16 @@ static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
var = create_var(hist_data, file, field_name, val->size, val->type);
if (IS_ERR(var)) {
hist_err(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name));
kfree(val);
destroy_hist_field(val, 0);
ret = PTR_ERR(var);
goto err;
}
field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL);
if (!field_var) {
kfree(val);
destroy_hist_field(val, 0);
kfree_const(var->type);
kfree(var->var.name);
kfree(var);
ret = -ENOMEM;
goto err;