[tip:perf/core] perf tools: Do not accept parse_tag_value() overflow

[tip-bot for Adrian Hunter]

Commit-ID:  56921becdd1eb0720603fc2e6e4c7f518196d917
Gitweb:     http://git.kernel.org/tip/56921becdd1eb0720603fc2e6e4c7f518196d917
Author:     Adrian Hunter <adrian.hunter@xxxxxxxxx>
AuthorDate: Tue, 22 Oct 2013 10:34:17 +0300
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 23 Oct 2013 10:59:09 -0300

perf tools: Do not accept parse_tag_value() overflow

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>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1382427258-17495-14-git-send-email-adrian.hunter@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 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;
 		}
--
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