avcodec/vp9: assert on sane size in update_size().

w and h are both read as uint16 + 1 so this can not happen. A similar
change was introduced in 97962b2 / 72ca830, with the
av_log()+AVERROR_INVALIDDATA form, suggesting it could be triggerable
somehow.

Change suggested by Ronald S. Bultje.

1 files changed, 2 insertions, 0 deletions

diff --git a/libavcodec/vp9.c b/libavcodec/vp9.c
index 745bbd6218..785b18725c 100644
--- a/libavcodec/vp9.c
+++ b/libavcodec/vp9.c
@@ -243,6 +243,8 @@ static int update_size(AVCodecContext *ctx, int w, int h)
     VP9Context *s = ctx->priv_data;
     uint8_t *p;
 
+    av_assert0(w > 0 && h > 0);
+
     if (s->above_partition_ctx && w == ctx->width && h == ctx->height)
         return 0;