[FFmpeg-devel] [PATCH] avcodec/vp8dsp: zeroise input coefficient array after use in vp7 idct functions

[Peter Ross]

Signed-off-by: Peter Ross <pross at xvid.org>
---
 libavcodec/vp8dsp.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libavcodec/vp8dsp.c b/libavcodec/vp8dsp.c
index 6c8aea7..bb6b1f5 100644
--- a/libavcodec/vp8dsp.c
+++ b/libavcodec/vp8dsp.c
@@ -50,6 +50,10 @@ static void vp7_luma_dc_wht_c(int16_t block[4][4][16], int16_t dc[16])
         b1 = (tmp[i + 0] - tmp[i + 8]) * 23170;
         c1 = tmp[i + 4] * 12540 - tmp[i + 12] * 30274;
         d1 = tmp[i + 4] * 30274 + tmp[i + 12] * 12540;
+        dc[i*4+0] = 0;
+        dc[i*4+1] = 0;
+        dc[i*4+2] = 0;
+        dc[i*4+3] = 0;
         block[0][i][0] = (a1 + d1 + 0x20000) >> 18;
         block[3][i][0] = (a1 - d1 + 0x20000) >> 18;
         block[1][i][0] = (b1 + c1 + 0x20000) >> 18;
@@ -80,6 +84,10 @@ static void vp7_idct_add_c(uint8_t *dst, int16_t block[16], ptrdiff_t stride)
         b1 = (block[i*4+0] - block[i*4+2]) * 23170;
         c1 = block[i*4+1] * 12540 - block[i*4+3] * 30274;
         d1 = block[i*4+1] * 30274 + block[i*4+3] * 12540;
+        block[i*4+0] = 0;
+        block[i*4+1] = 0;
+        block[i*4+2] = 0;
+        block[i*4+3] = 0;
         tmp[i*4+0] = (a1 + d1) >> 14;
         tmp[i*4+3] = (a1 - d1) >> 14;
         tmp[i*4+1] = (b1 + c1) >> 14;
-- 
1.8.3.2

-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
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