From: Dan Carpenter <dan.carpenter@oracle.com> To: Steven Rostedt <rostedt@goodmis.org>, Tom Zanussi <tom.zanussi@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com>, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH] tracing: Uninitialized variable in create_tracing_map_fields() Date: Wed, 28 Mar 2018 14:48:15 +0300 [thread overview] Message-ID: <20180328114815.GC29050@mwanda> (raw) 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];
WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com> To: Steven Rostedt <rostedt@goodmis.org>, Tom Zanussi <tom.zanussi@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com>, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH] tracing: Uninitialized variable in create_tracing_map_fields() Date: Wed, 28 Mar 2018 11:48:15 +0000 [thread overview] Message-ID: <20180328114815.GC29050@mwanda> (raw) 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];
next reply other threads:[~2018-03-28 11:50 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-03-28 11:48 Dan Carpenter [this message] 2018-03-28 11:48 ` [PATCH] tracing: Uninitialized variable in create_tracing_map_fields() Dan Carpenter 2018-03-28 14:04 ` Tom Zanussi 2018-03-28 14:04 ` Tom Zanussi 2018-04-02 15:52 ` Steven Rostedt 2018-04-02 15:52 ` Steven Rostedt
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