linux-kernel - [for-linus][PATCH 1/4] tracing: Fix the checking of stackidx in __ftrace_trace

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Date:   Thu, 05 Nov 2020 11:24:59 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Qiujun Huang <hqjagain@...il.com>
Subject: [for-linus][PATCH 1/4] tracing: Fix the checking of stackidx in __ftrace_trace_stack

From: Qiujun Huang <hqjagain@...il.com>

The array size is FTRACE_KSTACK_NESTING, so the index FTRACE_KSTACK_NESTING
is illegal too. And fix two typos by the way.

Link: https://lkml.kernel.org/r/20201031085714.2147-1-hqjagain@gmail.com

Signed-off-by: Qiujun Huang <hqjagain@...il.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 kernel/trace/trace.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index daa96215e294..410cfeb16db5 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2750,7 +2750,7 @@ trace_event_buffer_lock_reserve(struct trace_buffer **current_rb,
 	/*
 	 * If tracing is off, but we have triggers enabled
 	 * we still need to look at the event data. Use the temp_buffer
-	 * to store the trace event for the tigger to use. It's recusive
+	 * to store the trace event for the trigger to use. It's recursive
 	 * safe and will not be recorded anywhere.
 	 */
 	if (!entry && trace_file->flags & EVENT_FILE_FL_TRIGGER_COND) {
@@ -2952,7 +2952,7 @@ static void __ftrace_trace_stack(struct trace_buffer *buffer,
 	stackidx = __this_cpu_inc_return(ftrace_stack_reserve) - 1;
 
 	/* This should never happen. If it does, yell once and skip */
-	if (WARN_ON_ONCE(stackidx > FTRACE_KSTACK_NESTING))
+	if (WARN_ON_ONCE(stackidx >= FTRACE_KSTACK_NESTING))
 		goto out;
 
 	/*
-- 
2.28.0