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improve logic of heap_type validation when ref.null #4372

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improve logic of heap_type validation when ref.null #4372

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fd5cfe4
Follow-up to PR #4300: prevent potential overflow
Septa2112 Jun 17, 2025
66cd7f6
Merge branch 'main' into fix/overflow
Septa2112 Jun 17, 2025
d0aac00
improve error message
Septa2112 Jun 17, 2025
58aae86
Refine heap_type validation and corresponding type1 calculation
Septa2112 Jun 17, 2025
038e2fc
Removed some redundant logic
Septa2112 Jun 18, 2025
0020653
Merged the if-else conditions
Septa2112 Jun 20, 2025
17ac8c1
improve logic and comments
Septa2112 Jun 25, 2025
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28 changes: 18 additions & 10 deletions core/iwasm/interpreter/wasm_loader.c
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Original file line number Diff line number Diff line change
Expand Up @@ -843,21 +843,29 @@ load_init_expr(WASMModule *module, const uint8 **p_buf, const uint8 *buf_end,
#else
int32 heap_type;
read_leb_int32(p, p_end, heap_type);
type1 = (uint8)((int32)0x80 + heap_type);

if (heap_type >= 0) {
if (!check_type_index(module, module->type_count, heap_type,
error_buf, error_buf_size)) {
goto fail;
}
wasm_set_refheaptype_typeidx(&cur_ref_type.ref_ht_typeidx,
true, heap_type);
type1 = cur_ref_type.ref_type;
}
else {
if (!wasm_is_valid_heap_type(heap_type)) {
set_error_buf_v(error_buf, error_buf_size,
"unknown type %d", heap_type);
goto fail;
}
type1 = (uint8)((int32)0x80 + heap_type);
}

cur_value.gc_obj = NULL_REF;

if (!is_byte_a_type(type1)
|| !wasm_is_valid_heap_type(heap_type)
|| wasm_is_type_multi_byte_type(type1)) {
p--;
read_leb_uint32(p, p_end, type_idx);
if (!check_type_index(module, module->type_count, type_idx,
error_buf, error_buf_size))
goto fail;

wasm_set_refheaptype_typeidx(&cur_ref_type.ref_ht_typeidx,
true, type_idx);
if (!push_const_expr_stack(&const_expr_ctx, flag,
cur_ref_type.ref_type,
&cur_ref_type, 0, &cur_value,
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