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vc1: check the source buffer in vc1_mc functions 

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Luca Barbato 2013-08-05 06:27:12 +02:00
parent 9991298f2c
commit 090cd06311
1 changed files with 15 additions and 0 deletions
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15
libavcodec/vc1dec.c
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@ -407,6 +407,11 @@ static void vc1_mc_1mv(VC1Context *v, int dir)
use_ic = v->next_use_ic;
}
if (!srcY || !srcU) {
av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");
return;
}
src_x = s->mb_x * 16 + (mx >> 2);
src_y = s->mb_y * 16 + (my >> 2);
uvsrc_x = s->mb_x * 8 + (uvmx >> 2);
@ -583,6 +588,11 @@ static void vc1_mc_4mv_luma(VC1Context *v, int n, int dir, int avg)
use_ic = v->next_use_ic;
}
if (!srcY) {
av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");
return;
}
if (v->field_mode) {
if (v->cur_field_type != v->ref_field_type[dir])
my = my - 2 + 4 * v->cur_field_type;
@ -879,6 +889,11 @@ static void vc1_mc_4mv_chroma(VC1Context *v, int dir)
use_ic = v->next_use_ic;
}
if (!srcU) {
av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");
return;
}
srcU += uvsrc_y * s->uvlinesize + uvsrc_x;
srcV += uvsrc_y * s->uvlinesize + uvsrc_x;