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Code Issues Releases Activity

avcodec/mpegvideo_motion: Fix off by 1 error in MV bounds checking

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Fixes Ticket4299

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-03-08 01:27:56 +01:00
parent 6c583e9048
commit 9f0eaf792a
1 changed files with 4 additions and 4 deletions
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8
libavcodec/mpegvideo_motion.c
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@ -210,8 +210,8 @@ static inline int hpel_motion(MpegEncContext *s,
dxy |= (motion_y & 1) << 1;
src += src_y * s->linesize + src_x;
if ((unsigned)src_x > FFMAX(s->h_edge_pos - (motion_x & 1) - 8, 0) ||
(unsigned)src_y > FFMAX(s->v_edge_pos - (motion_y & 1) - 8, 0)) {
if ((unsigned)src_x >= FFMAX(s->h_edge_pos - (motion_x & 1) - 7, 0) ||
(unsigned)src_y >= FFMAX(s->v_edge_pos - (motion_y & 1) - 7, 0)) {
s->vdsp.emulated_edge_mc(s->edge_emu_buffer, src,
s->linesize, s->linesize,
9, 9,
@ -306,8 +306,8 @@ void mpeg_motion_internal(MpegEncContext *s,
ptr_cb = ref_picture[1] + uvsrc_y * uvlinesize + uvsrc_x;
ptr_cr = ref_picture[2] + uvsrc_y * uvlinesize + uvsrc_x;
if ((unsigned)src_x > FFMAX(s->h_edge_pos - (motion_x & 1) - 16, 0) ||
(unsigned)src_y > FFMAX( v_edge_pos - (motion_y & 1) - h , 0)) {
if ((unsigned)src_x >= FFMAX(s->h_edge_pos - (motion_x & 1) - 15 , 0) ||
(unsigned)src_y >= FFMAX( v_edge_pos - (motion_y & 1) - h + 1, 0)) {
if (is_mpeg12 ||
s->codec_id == AV_CODEC_ID_MPEG2VIDEO ||
s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {