Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: [email protected]
---
libavcodec/vc1dec.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index e8c2232..20633d7 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -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;
--
1.8.3.2
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