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Fix out of bounds issue in is_native_addr_in_shared_heap function #3886

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Oct 31, 2024
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Fix out of bounds issue in is_native_addr_in_shared_heap function #3886

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28 changes: 23 additions & 5 deletions core/iwasm/common/wasm_memory.c
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Original file line number Diff line number Diff line change
Expand Up @@ -420,13 +420,31 @@ is_native_addr_in_shared_heap(WASMModuleInstanceCommon *module_inst,
uint8 *addr, uint32 bytes)
{
WASMSharedHeap *heap = get_shared_heap(module_inst);
uintptr_t base_addr;
uintptr_t addr_int;
uintptr_t end_addr;

if (heap && addr >= heap->base_addr
&& addr + bytes <= heap->base_addr + heap->size
&& addr + bytes > addr) {
return true;
if (!heap) {
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return false;
}
return false;

base_addr = (uintptr_t)heap->base_addr;
addr_int = (uintptr_t)addr;
if (addr_int < base_addr) {
return false;
}

end_addr = addr_int + bytes;
/* Check for overflow */
if (end_addr <= addr_int) {
return false;
}

if (end_addr > base_addr + heap->size) {
return false;
}

return true;
}

uint64
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