From a707d18a48898342046014f41a030b82bf1be0b3 Mon Sep 17 00:00:00 2001 From: Peter Ross Date: Sun, 16 Feb 2014 15:32:59 +1100 Subject: [PATCH] avcodec/vp8dsp: zeroise input coefficient array after use in vp7 idct functions Signed-off-by: Peter Ross Reviewed-by: "Ronald S. Bultje" Signed-off-by: Michael Niedermayer --- libavcodec/vp8dsp.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/libavcodec/vp8dsp.c b/libavcodec/vp8dsp.c index 6c8aea7492..bb6b1f5ec5 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;