[PATCH V2 13/14] perf tools: Do not accept parse_tag_value() overflow

[Adrian Hunter]

parse_tag_value() accepts an "unsigned long" and
multiplies it according to a tag character.  Do
not accept the value if the multiplication
overflows.

Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
 tools/perf/util/util.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index c25e57b..28a0a89 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -386,6 +386,8 @@ unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
 			if (s != endptr)
 				break;
 
+			if (value > ULONG_MAX / i->mult)
+				break;
 			value *= i->mult;
 			return value;
 		}
-- 
1.7.11.7

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