From: Steven Rostedt (Google) rostedt@goodmis.org
commit 9971c3f944489ff7aacb9d25e0cde841a5f6018a upstream.
The test to check if the field is a stack is to be done if it is not a string. But the code had:
} if (event->fields[i]->is_stack) {
and not
} else if (event->fields[i]->is_stack) {
which would cause it to always be tested. Worse yet, this also included an "else" statement that was only to be called if the field was not a string and a stack, but this code allows it to be called if it was a string (and not a stack).
Also fixed some whitespace issues.
Link: https://lore.kernel.org/all/202301302110.mEtNwkBD-lkp@intel.com/ Link: https://lore.kernel.org/linux-trace-kernel/20230131095237.63e3ca8d@gandalf.l...
Cc: Tom Zanussi zanussi@kernel.org Fixes: 00cf3d672a9d ("tracing: Allow synthetic events to pass around stacktraces") Reported-by: kernel test robot lkp@intel.com Signed-off-by: Steven Rostedt (Google) rostedt@goodmis.org Acked-by: Masami Hiramatsu (Google) mhiramat@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/trace/trace_events_synth.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/kernel/trace/trace_events_synth.c +++ b/kernel/trace/trace_events_synth.c @@ -557,8 +557,8 @@ static notrace void trace_event_raw_even event->fields[i]->is_dynamic, data_size, &n_u64); data_size += len; /* only dynamic string increments */ - } if (event->fields[i]->is_stack) { - long *stack = (long *)(long)var_ref_vals[val_idx]; + } else if (event->fields[i]->is_stack) { + long *stack = (long *)(long)var_ref_vals[val_idx];
len = trace_stack(entry, event, stack, data_size, &n_u64);