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tracing: tprobe-events: Fix a memory leak when tprobe with $retval

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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.

Link: https://lore.kernel.org/all/174055072650.4079315.3063014346697447838.stgit@mhiramat.tok.corp.google.com/

Fixes: ce51e6153f ("tracing: fprobe-event: Fix to check tracepoint event and return")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Masami Hiramatsu (Google) 2025-02-26 15:18:46 +09:00
parent d082ecbc71
commit ac965d7d88
1 changed files with 2 additions and 0 deletions
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2
kernel/trace/trace_fprobe.c
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@ -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;