From 484f8d77c6ecf995ac89d1071d3be0cae1f5326c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20B=C5=93sch?= <u@pkh.me>
Date: Sat, 16 Nov 2013 22:47:32 +0100
Subject: [PATCH] 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.
---
 libavcodec/vp9.c | 2 ++
 1 file changed, 2 insertions(+)

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;