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Subject[PATCH] tracing: Fix trace_event_raw_event_synth() if else statement
From: "Steven Rostedt (Google)" <rostedt@goodmis.org>

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/

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>
---
kernel/trace/trace_events_synth.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c
index adb630633f31..306c89e0ce55 100644
--- a/kernel/trace/trace_events_synth.c
+++ b/kernel/trace/trace_events_synth.c
@@ -564,8 +564,8 @@ static notrace void trace_event_raw_event_synth(void *__data,
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);
--
2.39.0
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