[PATCH] perf: fix raw sample size if no sampling data is attached

[Robert Richter]

The header size of a raw sample is not included in the total size of a
raw data sample. Thus, if no data is attached the size must be
null. In this case a buffer overflow may occur when copying the
sampling data.

Signed-off-by: Robert Richter <robert.richter@xxxxxxx>
---
 kernel/perf_event.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 9dbe8cd..f6ddae9 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -3229,7 +3229,7 @@ void perf_output_sample(struct perf_output_handle *handle,
 				u32	size;
 				u32	data;
 			} raw = {
-				.size = sizeof(u32),
+				.size = 0,
 				.data = 0,
 			};
 			perf_output_put(handle, raw);
-- 
1.7.0.3

-- 
Advanced Micro Devices, Inc.
Operating System Research Center
email: robert.richter@xxxxxxx

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