[PATCH 1/8] tracing: tprobe-events: Fix a memory leak when tprobe with $retval

Masami Hiramatsu (Google)
2025-02-26T06:18:49Z

From: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Fix a memory leak when a tprobe is defined with $retval. This
combination is not allowed, but the parse_symbol_and_return() does
not free the *symbol which should not be used if it returns the error.
Thus, it leaks the *symbol memory in that error path.

Fixes: ce51e6153f77 ("tracing: fprobe-event: Fix to check tracepoint event and return")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: stable@vger.kernel.org
---
kernel/trace/trace_fprobe.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/kernel/trace/trace_fprobe.c b/kernel/trace/trace_fprobe.c
index b8f3c4ba309b..8826f44f69a4 100644
--- a/kernel/trace/trace_fprobe.c
+++ b/kernel/trace/trace_fprobe.c
@@ -1056,6 +1056,8 @@ static int parse_symbol_and_return(int argc, const char *argv[],
if (is_tracepoint) {
trace_probe_log_set_index(i);
trace_probe_log_err(tmp - argv[i], RETVAL_ON_PROBE);
+ kfree(*symbol);
+ *symbol = NULL;
return -EINVAL;
}
*is_return = true;