* [PATCH] tracing: Uninitialized variable in create_tracing_map_fields()
@ 2018-03-28 11:48 Dan Carpenter
2018-03-28 14:04 ` Tom Zanussi
0 siblings, 1 reply; 3+ messages in thread
From: Dan Carpenter @ 2018-03-28 11:48 UTC (permalink / raw)
To: Steven Rostedt, Tom Zanussi; +Cc: Ingo Molnar, linux-kernel, kernel-janitors
Smatch complains that idx can be used uninitialized when we check if
(idx < 0). It has to be the first iteration through the loop and the
HIST_FIELD_FL_STACKTRACE bit has to be clear and the HIST_FIELD_FL_VAR
bit has to be set to reach the bug.
Fixes: 30350d65ac56 ("tracing: Add variable support to hist triggers")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 4f027642ceef..6aceee287d07 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -4411,7 +4411,7 @@ static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
struct tracing_map *map = hist_data->map;
struct ftrace_event_field *field;
struct hist_field *hist_field;
- int i, idx;
+ int i, idx = 0;
for_each_hist_field(i, hist_data) {
hist_field = hist_data->fields[i];
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] tracing: Uninitialized variable in create_tracing_map_fields()
2018-03-28 11:48 [PATCH] tracing: Uninitialized variable in create_tracing_map_fields() Dan Carpenter
@ 2018-03-28 14:04 ` Tom Zanussi
2018-04-02 15:52 ` Steven Rostedt
0 siblings, 1 reply; 3+ messages in thread
From: Tom Zanussi @ 2018-03-28 14:04 UTC (permalink / raw)
To: Dan Carpenter; +Cc: Steven Rostedt, Ingo Molnar, linux-kernel, kernel-janitors
Hi Dan,
On Wed, 2018-03-28 at 14:48 +0300, Dan Carpenter wrote:
> Smatch complains that idx can be used uninitialized when we check if
> (idx < 0). It has to be the first iteration through the loop and the
> HIST_FIELD_FL_STACKTRACE bit has to be clear and the HIST_FIELD_FL_VAR
> bit has to be set to reach the bug.
>
> Fixes: 30350d65ac56 ("tracing: Add variable support to hist triggers")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
> index 4f027642ceef..6aceee287d07 100644
> --- a/kernel/trace/trace_events_hist.c
> +++ b/kernel/trace/trace_events_hist.c
> @@ -4411,7 +4411,7 @@ static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
> struct tracing_map *map = hist_data->map;
> struct ftrace_event_field *field;
> struct hist_field *hist_field;
> - int i, idx;
> + int i, idx = 0;
>
> for_each_hist_field(i, hist_data) {
> hist_field = hist_data->fields[i];
Yes, this should definitely be initialized to 0, thanks for the patch!
Acked-by: Tom Zanussi <tom.zanussi@linux.intel.com>
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] tracing: Uninitialized variable in create_tracing_map_fields()
2018-03-28 14:04 ` Tom Zanussi
@ 2018-04-02 15:52 ` Steven Rostedt
0 siblings, 0 replies; 3+ messages in thread
From: Steven Rostedt @ 2018-04-02 15:52 UTC (permalink / raw)
To: Tom Zanussi; +Cc: Dan Carpenter, Ingo Molnar, linux-kernel, kernel-janitors
On Wed, 28 Mar 2018 09:04:40 -0500
Tom Zanussi <tom.zanussi@linux.intel.com> wrote:
> Yes, this should definitely be initialized to 0, thanks for the patch!
>
> Acked-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Thanks, I applied it and will push to git after it has succeeded in
testing.
-- Steve
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-04-02 15:52 UTC | newest]
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2018-03-28 11:48 [PATCH] tracing: Uninitialized variable in create_tracing_map_fields() Dan Carpenter
2018-03-28 14:04 ` Tom Zanussi
2018-04-02 15:52 ` Steven Rostedt
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