From d1c99c5d5290de8be60af340bbb79d41e92dac8f Mon Sep 17 00:00:00 2001
From: Liam <byteslice@airmail.cc>
Date: Thu, 28 Dec 2023 01:15:29 -0500
Subject: ips_layer: prevent out of bounds access with offset exceeding module
 size

---
 src/core/file_sys/ips_layer.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/core/file_sys/ips_layer.cpp b/src/core/file_sys/ips_layer.cpp
index 7be1322cc..31033634c 100644
--- a/src/core/file_sys/ips_layer.cpp
+++ b/src/core/file_sys/ips_layer.cpp
@@ -73,6 +73,9 @@ VirtualFile PatchIPS(const VirtualFile& in, const VirtualFile& ips) {
         return nullptr;
 
     auto in_data = in->ReadAllBytes();
+    if (in_data.size() == 0) {
+        return nullptr;
+    }
 
     std::vector<u8> temp(type == IPSFileType::IPS ? 3 : 4);
     u64 offset = 5; // After header
@@ -88,6 +91,10 @@ VirtualFile PatchIPS(const VirtualFile& in, const VirtualFile& ips) {
         else
             real_offset = (temp[0] << 16) | (temp[1] << 8) | temp[2];
 
+        if (real_offset > in_data.size()) {
+            return nullptr;
+        }
+
         u16 data_size{};
         if (ips->ReadObject(&data_size, offset) != sizeof(u16))
             return nullptr;
-- 
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