From: Steven Rostedt <srostedt@redhat.com>
Date: Wed, 29 Apr 2009 04:16:21 +0000 (-0400)
Subject: tracing: fix ref count in splice pages
X-Git-Tag: firefly_0821_release~14243^2~1
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7267fa6819467669f5cc2ba81a615dcc88158b4b;p=firefly-linux-kernel-4.4.55.git

tracing: fix ref count in splice pages

The pages allocated for the splice binary buffer did not initialize
the ref count correctly. This caused pages not to be freed and causes
a drastic memory leak.

Thanks to logdev I was able to trace the tracer to find where the leak
was.

[ Impact: stop memory leak when using splice ]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 1ce5dc6372b8..a884c09006c4 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3448,6 +3448,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
 		if (!ref)
 			break;
 
+		ref->ref = 1;
 		ref->buffer = info->tr->buffer;
 		ref->page = ring_buffer_alloc_read_page(ref->buffer);
 		if (!ref->page) {