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vp9,read_inter_block_mode_info: quiet msan warning

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best_sub8x8[1] won't be used meaningfully when is_compound is false, but
may trigger an msan warning as the value is copied around and later
clamped.

BUG=667044

Change-Id: Icc24c3b72cdb550bebea44d4aaa4ff8bf3fbab56
This commit is contained in:
James Zern 2016-11-21 18:20:33 -08:00
parent 0ffbb36ddc
commit cb22359d02
4 changed files with 9 additions and 0 deletions
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1
test/invalid_file_test.cc
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@ -144,6 +144,7 @@ const DecodeParam kVP9InvalidFileTests[] = {
{ 1, "invalid-vp90-2-03-size-202x210.webm.ivf.s113306_r01-05_b6-.ivf" },
{ 1,
"invalid-vp90-2-10-show-existing-frame.webm.ivf.s180315_r01-05_b6-.ivf" },
{ 1, "invalid-crbug-667044.webm" },
};
VP9_INSTANTIATE_TEST_CASE(InvalidFileTest,

2
test/test-data.mk
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@ -777,6 +777,8 @@ LIBVPX_TEST_DATA-$(CONFIG_VP9_DECODER) += invalid-vp90-2-07-frame_parallel-2.web
LIBVPX_TEST_DATA-$(CONFIG_VP9_DECODER) += invalid-vp90-2-07-frame_parallel-3.webm
LIBVPX_TEST_DATA-$(CONFIG_VP9_DECODER) += invalid-crbug-629481.webm
LIBVPX_TEST_DATA-$(CONFIG_VP9_DECODER) += invalid-crbug-629481.webm.res
LIBVPX_TEST_DATA-$(CONFIG_VP9_DECODER) += invalid-crbug-667044.webm
LIBVPX_TEST_DATA-$(CONFIG_VP9_DECODER) += invalid-crbug-667044.webm.res
ifeq ($(CONFIG_DECODE_PERF_TESTS),yes)
# Encode / Decode test

2
test/test-data.sha1
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@ -845,3 +845,5 @@ a000d568431d07379dd5a8ec066061c07e560b47 *invalid-vp90-2-00-quantizer-63.ivf.kf_
7602e00378161ca36ae93cc6ee12dd30b5ba1e1d *vp90-2-22-svc_1280x720_3.ivf
02e53e3eefbf25ec0929047fe50876acdeb040bd *vp90-2-22-svc_1280x720_3.ivf.md5
6fa3d3ac306a3d9ce1d610b78441dc00d2c2d4b9 *tos_vp8.webm
e402cbbf9e550ae017a1e9f1f73931c1d18474e8 *invalid-crbug-667044.webm
d3964f9dad9f60363c81b688324d95b4ec7c8038 *invalid-crbug-667044.webm.res

4
vp9/decoder/vp9_decodemv.c
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@ -770,6 +770,10 @@ static void read_inter_block_mode_info(VP9Decoder *const pbi,
int idx, idy;
PREDICTION_MODE b_mode;
int_mv best_sub8x8[2];
const uint32_t invalid_mv = 0x80008000;
// Initialize the 2nd element as even though it won't be used meaningfully
// if is_compound is false, copying/clamping it may trigger a MSan warning.
best_sub8x8[1].as_int = invalid_mv;
for (idy = 0; idy < 2; idy += num_4x4_h) {
for (idx = 0; idx < 2; idx += num_4x4_w) {
const int j = idy * 2 + idx;