[graphics/kdegraphics-mobipocket/release/26.08] lib: Protect against malformed header size

Git commit 204022265447bfb738b488a05ef24860379062d7 by Albert Astals Cid.
Committed on 31/07/2026 at 11:09.
Pushed by aacid into branch 'release/26.08'.

Protect against malformed header size

(cherry picked from commit 46cae2d51539bc307dd0b102fd27372ebc0365d5)

M  +1    -1    lib/mobipocket.cpp

https://invent.kde.org/graphics/kdegraphics-mobipocket/-/commit/204022265447bfb738b488a05ef24860379062d7

diff --git a/lib/mobipocket.cpp b/lib/mobipocket.cpp
index 6dbba8c..7901411 100644
--- a/lib/mobipocket.cpp
+++ b/lib/mobipocket.cpp
@@ -78,7 +78,7 @@ namespace
     const QVector<QByteArray> getHuffRecords(const PDB &pdb)
     {
         const QByteArray header = pdb.getRecord(0);
-        if (header[1] != 'H') {
+        if (header.size() < 0x78 || header[1] != 'H') {
             return {};
         }