From: Michael Niedermayer <[email protected]>
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <[email protected]>
---
libavcodec/vc1dec.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index e34e8d2..c63ccf1 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -5600,6 +5600,10 @@ static int vc1_decode_frame(AVCodecContext *avctx, void
*data,
s->end_mb_y = (i == n_slices ) ? mb_height :
FFMIN(mb_height, slices[i].mby_start % mb_height);
else
s->end_mb_y = (i <= n_slices1 + 1) ? mb_height :
FFMIN(mb_height, slices[i].mby_start % mb_height);
+ if (s->end_mb_y <= s->start_mb_y) {
+ av_log(v->s.avctx, AV_LOG_ERROR, "end mb y %d %d invalid\n",
s->end_mb_y, s->start_mb_y);
+ continue;
+ }
vc1_decode_blocks(v);
if (i != n_slices)
s->gb = slices[i].gb;
--
1.7.4
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