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For TypedArrays read byteOffset before getting start and final #422

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For TypedArrays read byteOffset before getting start and final #422

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20 changes: 14 additions & 6 deletions quickjs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -54097,14 +54097,24 @@ static JSValue js_typed_array_subarray(JSContext *ctx, JSValueConst this_val,
int argc, JSValueConst *argv)
{
JSValueConst args[4];
JSValue arr, ta_buffer;
JSTypedArray *ta;
JSValue arr, byteOffset, ta_buffer;
JSObject *p;
int len, start, final, count, shift, offset;
int len, start, final, count, shift, byte_offset, offset;

p = get_typed_array(ctx, this_val, 0);
if (!p)
goto exception;

/* Fetch byteOffset first, then access start and final. It's technically
possible for the buffer to be detached when accessing start of final, by
way of `valueOf()` for instance, and the spec indicates we should preserve
the byteOffset value from before it might be detached */
byteOffset = js_typed_array_get_byteOffset(ctx, this_val, 0);
if (JS_IsException(byteOffset))
goto exception;
byte_offset = JS_VALUE_GET_INT(byteOffset);
JS_FreeValue(ctx, byteOffset);

len = p->u.array.count;
if (JS_ToInt32Clamp(ctx, &start, argv[0], 0, len, len))
goto exception;
Expand All @@ -54116,9 +54126,7 @@ static JSValue js_typed_array_subarray(JSContext *ctx, JSValueConst this_val,
}
count = max_int(final - start, 0);
shift = typed_array_size_log2(p->class_id);
ta = p->u.typed_array;
/* Read byteOffset (ta->offset) even if detached */
offset = ta->offset + (start << shift);
offset = byte_offset + (start << shift);
ta_buffer = js_typed_array_get_buffer(ctx, this_val, 0);
if (JS_IsException(ta_buffer))
goto exception;
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