From 8ad43638ad55cf9bfc12af35aa3c33bd255dd375 Mon Sep 17 00:00:00 2001
From: Albert Astals Cid <aacid@kde.org>
Date: Tue, 5 Jan 2021 20:48:29 +0100
Subject: [PATCH] Fix crash with malformed files

oss-fuzz/29284
---
 src/imageformats/ani.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/imageformats/ani.cpp b/src/imageformats/ani.cpp
index 72eb09e..13a0a07 100644
--- a/src/imageformats/ani.cpp
+++ b/src/imageformats/ani.cpp
@@ -109,6 +109,9 @@ bool ANIHandler::read(QImage *outImage)
     if (!m_imageSequence.isEmpty()) {
         if (m_currentImageNumber < m_imageSequence.count()) {
             const int nextFrame = m_imageSequence.at(m_currentImageNumber);
+            if (nextFrame < 0 || nextFrame >= m_frameOffsets.count()) {
+                return false;
+            }
             const auto nextOffset = m_frameOffsets.at(nextFrame);
             device()->seek(nextOffset);
         } else if (m_currentImageNumber == m_imageSequence.count()) {