[PATCH v2] tracing: Fix synth event printk format for str fields

From: Douglas RAILLARD
Date: Tue Mar 25 2025 - 12:54:38 EST


From: Douglas Raillard <douglas.raillard@xxxxxxx>

The printk format for synth event uses "%.*s" to print string fields,
but then only passes the pointer part as var arg.

Replace %.*s with %s as the C string is guaranteed to be null-terminated.

Signed-off-by: Douglas Raillard <douglas.raillard@xxxxxxx>
---
kernel/trace/trace_events_synth.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c
index e3f7d09e5512..f71e49cd35b0 100644
--- a/kernel/trace/trace_events_synth.c
+++ b/kernel/trace/trace_events_synth.c
@@ -305,7 +305,7 @@ static const char *synth_field_fmt(char *type)
else if (strcmp(type, "gfp_t") == 0)
fmt = "%x";
else if (synth_field_is_string(type))
- fmt = "%.*s";
+ fmt = "%s";
else if (synth_field_is_stack(type))
fmt = "%s";

--
2.43.0