Fix off-by-one

Author: vshymanskyy

examples/Wasm_Blink/Wasm_Blink.ino

@@ -178,7 +178,7 @@ void wasm_task(void*)
 #endif
 
     IM3Module module;
-    result = m3_ParseModule (env, &module, app_wasm, app_wasm_len-1);
+    result = m3_ParseModule (env, &module, app_wasm, app_wasm_len);
     if (result) FATAL("ParseModule", result);
 
     result = m3_LoadModule (runtime, module);

examples/Wasm_Fibonacci/Wasm_Fibonacci.ino

@@ -48,7 +48,7 @@ void wasm_task(void*)
     if (!runtime) FATAL("NewRuntime", "failed");
 
     IM3Module module;
-    result = m3_ParseModule (env, &module, fib_wasm, sizeof(fib_wasm)-1);
+    result = m3_ParseModule (env, &module, fib_wasm, sizeof(fib_wasm));
     if (result) FATAL("ParseModule", result);
 
     result = m3_LoadModule (runtime, module);
@@ -117,3 +117,4 @@ void loop()
 {
     delay(100);
 }
+

examples_pio/Wasm_Advanced/wasm_vm/wasm_vm.ino

@@ -172,7 +172,7 @@ void wasm_task(void*)
 #endif
 
     IM3Module module;
-    result = m3_ParseModule (env, &module, app_wasm, app_wasm_len-1);
+    result = m3_ParseModule (env, &module, app_wasm, app_wasm_len);
     if (result) FATAL("ParseModule", result);
 
     result = m3_LoadModule (runtime, module);

src/m3_parse.c

@@ -570,6 +570,7 @@ _       (ReadLEB_u7 (& section, & pos, end));
         {
             u32 sectionLength;
 _           (ReadLEB_u32 (& sectionLength, & pos, end));
+			_throwif(m3Err_wasmMalformed, pos + sectionLength > end);
 _           (ParseModuleSection (module, section, pos, sectionLength));
 
             pos += sectionLength;