commit a3d3f1dd0a081540a62e27de999892c01ceff327
author Alon Zakai <azakai@google.com> Fri Apr 10 16:52:41 2020
committer Alon Zakai <azakai@google.com> Fri Apr 10 16:52:41 2020
tree 226fd21b02521a57ee0ac4f4e3db6ec5ff8e8ed5
parent 6a51af5d858b6d3378749d17065c44cf50b62a26

Check for an invalid emscripten-sbrk-ptr. Would have helped detect the SAFE_HEAP/SIDE_MODULE bug

src/passes/PostEmscripten.cpp

diff --git a/src/passes/PostEmscripten.cpp b/src/passes/PostEmscripten.cpp
index 8efaae8..65404ba 100644
--- a/src/passes/PostEmscripten.cpp
+++ b/src/passes/PostEmscripten.cpp
@@ -80,6 +80,9 @@
       runner->options.getArgumentOrDefault("emscripten-sbrk-ptr", "");
     if (sbrkPtrStr != "") {
       auto sbrkPtr = std::stoi(sbrkPtrStr);
+      if (sbrkPtr == 0 || sbrkPtr == -1) {
+        Fatal() << "Invalid value for emscripten-sbrk-ptr";
+      }
       ImportInfo imports(*module);
       auto* func = imports.getImportedFunction(ENV, "emscripten_get_sbrk_ptr");
       if (func) {