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fix for ubsan on unittest.h fastrand()

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internal math of the fastrand function uses a multiply
and add that overflows a signed int.  This triggers a
ubsan failure:

../../unit_test/../unit_test/unit_test.h:60:33: runtime error: signed integer overflow: 56248274 * 214013 cannot be represented in type 'int'

This change casts the intermediate math to unsigned
int to avoid the overflow.

For more info on ubsan, see
http://dev.chromium.org/developers/testing/undefinedbehaviorsanitizer

TESTED=Passing compilation using:
GYP_DEFINES="ubsan=1"
GYP_DEFINES="ubsan_vptr=1"

R=harryjin@google.com, pbos@webrtc.org
BUG=libyuv:563

Review URL: https://codereview.chromium.org/1662453003 .
This commit is contained in:
Frank Barchard 2016-02-02 14:32:12 -08:00
parent 05ed0c539c
commit 903c91cc2e
4 changed files with 11 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
README.chromium
View File

@ -1,6 +1,6 @@
Name: libyuv
URL: http://code.google.com/p/libyuv/
Version: 1570
Version: 1571
License: BSD
License File: LICENSE

2
include/libyuv/version.h
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@ -11,6 +11,6 @@
#ifndef INCLUDE_LIBYUV_VERSION_H_ // NOLINT
#define INCLUDE_LIBYUV_VERSION_H_
#define LIBYUV_VERSION 1570
#define LIBYUV_VERSION 1571
#endif // INCLUDE_LIBYUV_VERSION_H_ NOLINT

12
unit_test/unit_test.cc
View File

@ -20,7 +20,7 @@
// TODO(fbarchard): Add command line parsing to pass this as option.
#define BENCHMARK_ITERATIONS 1
int fastrand_seed = 0xfb;
unsigned int fastrand_seed = 0xfb;
DEFINE_int32(libyuv_width, 0, "width of test image.");
DEFINE_int32(libyuv_height, 0, "height of test image.");
@ -125,7 +125,7 @@ LibYUVColorTest::LibYUVColorTest() :
benchmark_cpu_info_ = atoi(cpu_flags); // NOLINT
}
if (FLAGS_libyuv_cpu_info) {
benchmark_cpu_info_ = FLAGS_libyuv_cpu_info;
benchmark_cpu_info_ = FLAGS_libyuv_cpu_info;
}
benchmark_pixels_div256_ = static_cast<int>((
static_cast<double>(Abs(benchmark_width_)) *
@ -177,7 +177,7 @@ LibYUVScaleTest::LibYUVScaleTest() :
benchmark_cpu_info_ = atoi(cpu_flags); // NOLINT
}
if (FLAGS_libyuv_cpu_info) {
benchmark_cpu_info_ = FLAGS_libyuv_cpu_info;
benchmark_cpu_info_ = FLAGS_libyuv_cpu_info;
}
benchmark_pixels_div256_ = static_cast<int>((
static_cast<double>(Abs(benchmark_width_)) *
@ -229,7 +229,7 @@ LibYUVRotateTest::LibYUVRotateTest() :
benchmark_cpu_info_ = atoi(cpu_flags); // NOLINT
}
if (FLAGS_libyuv_cpu_info) {
benchmark_cpu_info_ = FLAGS_libyuv_cpu_info;
benchmark_cpu_info_ = FLAGS_libyuv_cpu_info;
}
benchmark_pixels_div256_ = static_cast<int>((
static_cast<double>(Abs(benchmark_width_)) *
@ -281,7 +281,7 @@ LibYUVPlanarTest::LibYUVPlanarTest() :
benchmark_cpu_info_ = atoi(cpu_flags); // NOLINT
}
if (FLAGS_libyuv_cpu_info) {
benchmark_cpu_info_ = FLAGS_libyuv_cpu_info;
benchmark_cpu_info_ = FLAGS_libyuv_cpu_info;
}
benchmark_pixels_div256_ = static_cast<int>((
static_cast<double>(Abs(benchmark_width_)) *
@ -333,7 +333,7 @@ LibYUVBaseTest::LibYUVBaseTest() :
benchmark_cpu_info_ = atoi(cpu_flags); // NOLINT
}
if (FLAGS_libyuv_cpu_info) {
benchmark_cpu_info_ = FLAGS_libyuv_cpu_info;
benchmark_cpu_info_ = FLAGS_libyuv_cpu_info;
}
benchmark_pixels_div256_ = static_cast<int>((
static_cast<double>(Abs(benchmark_width_)) *

6
unit_test/unit_test.h
View File

@ -55,10 +55,10 @@ static inline double get_time() {
}
#endif
extern int fastrand_seed;
extern unsigned int fastrand_seed;
inline int fastrand() {
fastrand_seed = fastrand_seed * 214013 + 2531011;
return (fastrand_seed >> 16) & 0xffff;
fastrand_seed = fastrand_seed * 214013u + 2531011u;
return static_cast<int>((fastrand_seed >> 16) & 0xffff);
}
static inline void MemRandomize(uint8* dst, int64 len) {