From: Vasily Averin <vvs@virtuozzo.com>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
NeilBrown <neilb@suse.com>, Waiman Long <longman@redhat.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
Peter Oberparleiter <oberpar@linux.ibm.com>
Subject: [PATCH 3/7] t_next should increase position index
Date: Fri, 24 Jan 2020 10:02:51 +0300 [thread overview]
Message-ID: <8681248a-da16-5448-31fe-26df9e7cfc25@virtuozzo.com> (raw)
if seq_file .next fuction does not change position index,
read after some lseek can generate unexpected output.
https://bugzilla.kernel.org/show_bug.cgi?id=206283
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
---
kernel/trace/ftrace.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 9bf1f2c..ca25210 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3442,8 +3442,10 @@ static void *t_mod_start(struct seq_file *m, loff_t *pos)
loff_t l = *pos; /* t_probe_start() must use original pos */
void *ret;
- if (unlikely(ftrace_disabled))
+ if (unlikely(ftrace_disabled)) {
+ (*pos)++;
return NULL;
+ }
if (iter->flags & FTRACE_ITER_PROBE)
return t_probe_next(m, pos);
--
1.8.3.1
next reply other threads:[~2020-01-24 7:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-24 7:02 Vasily Averin [this message]
2020-01-29 17:12 ` Steven Rostedt
2020-01-30 7:17 ` Vasily Averin
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