From 2cda1960716f55986e1d46345bd8663a22ae2b6d Mon Sep 17 00:00:00 2001
From: Shaikh Ubaid <shaikhubaid769@gmail.com>
Date: Sat, 25 Mar 2023 07:59:55 +0530
Subject: [PATCH 1/2] WASMDecoder: throw error when sectionId < expected

---
 src/libasr/codegen/wasm_decoder.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/libasr/codegen/wasm_decoder.h b/src/libasr/codegen/wasm_decoder.h
index 9edb61080d..9b3ca475b6 100644
--- a/src/libasr/codegen/wasm_decoder.h
+++ b/src/libasr/codegen/wasm_decoder.h
@@ -349,9 +349,15 @@ class WASMDecoder {
                 "Expected: 0x00, 0x61, 0x73, 0x6D, 0x01, 0x00, 0x00, 0x00");
         }
         index += PREAMBLE_SIZE;
+        uint32_t expected_min_section_id = 1;
         while (index < wasm_bytes.size()) {
             uint32_t section_id = read_u32(wasm_bytes, index);
             uint32_t section_size = read_u32(wasm_bytes, index);
+            if (section_id < expected_min_section_id) {
+                throw CodeGenError("DecodeWASM: Invalid sectionId, expected id >= "
+                    + std::to_string(expected_min_section_id));
+            }
+            expected_min_section_id = section_id + 1;
             switch (section_id) {
                 case 1U:
                     decode_type_section(index);

From ce9d03fb3d71bb0d10556c92518c0624bb91d45f Mon Sep 17 00:00:00 2001
From: Shaikh Ubaid <shaikhubaid769@gmail.com>
Date: Sat, 25 Mar 2023 08:01:48 +0530
Subject: [PATCH 2/2] WASMDecoder: Remove unused commented code

---
 src/libasr/codegen/wasm_decoder.h | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/src/libasr/codegen/wasm_decoder.h b/src/libasr/codegen/wasm_decoder.h
index 9b3ca475b6..2e5ea8bd6d 100644
--- a/src/libasr/codegen/wasm_decoder.h
+++ b/src/libasr/codegen/wasm_decoder.h
@@ -361,35 +361,27 @@ class WASMDecoder {
             switch (section_id) {
                 case 1U:
                     decode_type_section(index);
-                    // exit(0);
                     break;
                 case 2U:
                     decode_imports_section(index);
-                    // exit(0);
                     break;
                 case 3U:
                     decode_function_section(index);
-                    // exit(0);
                     break;
                 case 5U:
                     decode_memory_section(index);
-                    // exit(0);
                     break;
                 case 6U:
                     decode_global_section(index);
-                    // exit(0);
                     break;
                 case 7U:
                     decode_export_section(index);
-                    // exit(0);
                     break;
                 case 10U:
                     decode_code_section(index);
-                    // exit(0)
                     break;
                 case 11U:
                     decode_data_section(index);
-                    // exit(0)
                     break;
                 default:
                     std::cout << "Unknown section id: " << section_id