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Subject[PATCH 4.14 50/94] perf util: Fix bad memory access in trace info.
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chris Phlipot <cphlipot0@gmail.com>

[ Upstream commit a72f64261359b7451f8478f2a2bf357b4e6c757f ]

In the write to the output_fd in the error condition of
record_saved_cmdline(), we are writing 8 bytes from a memory location on
the stack that contains a primitive that is only 4 bytes in size.
Change the primitive to 8 bytes in size to match the size of the write
in order to avoid reading unknown memory from the stack.

Signed-off-by: Chris Phlipot <cphlipot0@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180829061954.18871-1-cphlipot0@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
tools/perf/util/trace-event-info.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -379,7 +379,7 @@ out:

static int record_saved_cmdline(void)
{
- unsigned int size;
+ unsigned long long size;
char *path;
struct stat st;
int ret, err = 0;

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