commit 16ffc2a4606043bca9d79dc17e5bbc7344ba4128
author Behdad Esfahbod <behdad@behdad.org> Fri Mar 03 15:33:48 2023 -0700
committer Behdad Esfahbod <behdad@behdad.org> Fri Mar 03 15:33:48 2023 -0700
tree 77c4f64a3ced16b93048077f5dbd1c6b9efe17c4
parent 3858fc75bdf6ad43d619cb948c22cba36de2fd61

[wasm-api-shape] Avoid a couple of crashes

src/hb-wasm-api-shape.hh

diff --git a/src/hb-wasm-api-shape.hh b/src/hb-wasm-api-shape.hh
index 7e12969..622ff05 100644
--- a/src/hb-wasm-api-shape.hh
+++ b/src/hb-wasm-api-shape.hh
@@ -46,6 +46,14 @@
   HB_REF2OBJ (font);
   HB_REF2OBJ (buffer);
 
+  /* Pre-conditions that make hb_shape_full() crash should be checked here. */
+
+  if (unlikely (!buffer->ensure_unicode ()))
+    return false;
+
+  if (unlikely (!HB_DIRECTION_IS_VALID (buffer->props.direction)))
+    return false;
+
   HB_ARRAY_PARAM (const feature_t, features, num_features);
   if (unlikely (!features && num_features))
     return false;