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Fixed undefined behavior in UBSan.

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Fotis Panagiotopoulos 2022-10-11 19:03:49 +03:00 committed by Xiang Xiao
parent d3f84ba724
commit eec7f5da00
1 changed files with 4 additions and 2 deletions
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6
mm/ubsan/ubsan.c
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@ -158,9 +158,11 @@ static int64_t get_signed_val(FAR struct type_descriptor *type,
if (is_inline_int(type))
{
unsigned extra_bits = sizeof(int64_t) * 8 - type_bit_width(type);
uintptr_t ulong_val = (uintptr_t)val;
uint64_t mask = (1llu << extra_bits) - 1;
uint64_t ret = (uint64_t)val & mask;
return ((int64_t)ulong_val) << extra_bits >> extra_bits;
return (int64_t)(((ret & (1llu << (extra_bits - 1))) != 0) ?
ret | ~mask : ret);
}
return *(FAR int64_t *)val;