From a9d2c4aa25bdc68ee24b3e61ac29ae4533acdbf7 Mon Sep 17 00:00:00 2001
From: "HenD.YA" <yusmer96@gmail.com>
Date: Thu, 4 Jun 2026 01:46:43 -0500
Subject: [PATCH 1/3] Implement overflow check in MaxCompressedLength function

Add overflow check for buffer allocation in MaxCompressedLength
---
 snappy.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/snappy.cc b/snappy.cc
index ab61792..46d870c 100644
--- a/snappy.cc
+++ b/snappy.cc
@@ -194,6 +194,11 @@ inline uint16_t* TableEntry8ByteMatch(uint16_t* table, uint64_t bytes,
 }  // namespace
 
 size_t MaxCompressedLength(size_t source_bytes) {
+  // Avoid integer overflow that could cause undersized buffer allocations.
+  // Return SIZE_MAX to force a controlled allocation failure.
+  if (source_bytes > (SIZE_MAX - 32) / 7 * 6) {
+    return SIZE_MAX;
+  }
   // Compressed data can be defined as:
   //    compressed := item* literal*
   //    item       := literal* copy

From 56396853e39f0d25eaa9715aa045ae5f1c078ceb Mon Sep 17 00:00:00 2001
From: "HenD.YA" <yusmer96@gmail.com>
Date: Thu, 4 Jun 2026 02:11:18 -0500
Subject: [PATCH 2/3] Refactor MaxCompressedLength to use std::numeric_limits

Updated the overflow check to use std::numeric_limits<size_t>::max() for clarity.
---
 snappy.cc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/snappy.cc b/snappy.cc
index 46d870c..ce8bd88 100644
--- a/snappy.cc
+++ b/snappy.cc
@@ -195,9 +195,9 @@ inline uint16_t* TableEntry8ByteMatch(uint16_t* table, uint64_t bytes,
 
 size_t MaxCompressedLength(size_t source_bytes) {
   // Avoid integer overflow that could cause undersized buffer allocations.
-  // Return SIZE_MAX to force a controlled allocation failure.
-  if (source_bytes > (SIZE_MAX - 32) / 7 * 6) {
-    return SIZE_MAX;
+  // Return std::numeric_limits<size_t>::max() to force a controlled allocation failure.
+  if (source_bytes > (std::numeric_limits<size_t>::max() - 32) / 7 * 6) {
+    return std::numeric_limits<size_t>::max();
   }
   // Compressed data can be defined as:
   //    compressed := item* literal*

From 9d0af7cdb911a7765b953835827d6721f5bc24e3 Mon Sep 17 00:00:00 2001
From: "HenD.YA" <yusmer96@gmail.com>
Date: Thu, 4 Jun 2026 02:20:44 -0500
Subject: [PATCH 3/3] Add limits header to snappy.cc

---
 snappy.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/snappy.cc b/snappy.cc
index ce8bd88..9826151 100644
--- a/snappy.cc
+++ b/snappy.cc
@@ -74,6 +74,7 @@
 #include <cstdint>
 #include <cstdio>
 #include <cstring>
+#include <limits>
 #include <memory>
 #include <string>
 #include <utility>