linux-kernel - [PATCH] perf_events: fix bogus copy_to_user() in perf_event_read

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Date:	Mon, 23 Nov 2009 21:40:49 -0800 (PST)
From:	Stephane Eranian <eranian@...gle.com>
To:	linux-kernel@...r.kernel.org
Cc:	peterz@...radead.org, mingo@...e.hu, paulus@...ba.org,
	perfmon2-devel@...ts.sourceforge.net, eranian@...gle.com,
	eranian@...il.com
Subject: [PATCH] perf_events: fix bogus copy_to_user() in perf_event_read_group()

	[This is a repost due to a formatting problem with Gmail]

	When using an event group, the value and id for non leaders events were
	wrong due to invalid offset into the outgoing buffer.

	Signed-off-by: Stephane Eranian <eranian@...gle.com>

---
 perf_event.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 0b0d5f7..8306127 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -1826,7 +1826,7 @@ static int perf_event_read_group(struct perf_event *event,
 
 		size = n * sizeof(u64);
 
-		if (copy_to_user(buf + size, values, size)) {
+		if (copy_to_user(buf + ret, values, size)) {
 			ret = -EFAULT;
 			goto unlock;
 		}
--
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