From 1eda55510ae5d15ce3df9f496002508580899045 Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <cehoyos@ag.or.at>
Date: Sat, 16 May 2015 22:51:16 +0200
Subject: [PATCH] lavc/qdrw: Fix overwrite when reading invalid Quickdraw
 images.

---
 libavcodec/qdrw.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/qdrw.c b/libavcodec/qdrw.c
index 6c920aa460..0bcf5dca22 100644
--- a/libavcodec/qdrw.c
+++ b/libavcodec/qdrw.c
@@ -95,6 +95,8 @@ static int decode_rle(AVCodecContext *avctx, AVFrame *p, GetByteContext *gbc,
                         pos -= offset;
                         pos++;
                     }
+                    if (pos >= offset)
+                        return AVERROR_INVALIDDATA;
                 }
                 left  -= 2;
             } else { /* copy */
@@ -105,6 +107,8 @@ static int decode_rle(AVCodecContext *avctx, AVFrame *p, GetByteContext *gbc,
                         pos -= offset;
                         pos++;
                     }
+                    if (pos >= offset)
+                        return AVERROR_INVALIDDATA;
                 }
                 left  -= 2 + code;
             }