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Fix UB in bf_set_ui()

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Ref: https://github.com/bellard/quickjs/issues/131
This commit is contained in:
bellard 2023-12-01 17:56:22 +01:00 committed by Saúl Ibarra Corretgé
parent 6b3bed1740
commit 148a205b71
1 changed files with 16 additions and 16 deletions
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32
libbf.c
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@ -164,6 +164,21 @@ static inline slimb_t sat_add(slimb_t a, slimb_t b)
return r;
}
static inline __maybe_unused limb_t shrd(limb_t low, limb_t high, long shift)
{
if (shift != 0)
low = (low >> shift) | (high << (LIMB_BITS - shift));
return low;
}
static inline __maybe_unused limb_t shld(limb_t a1, limb_t a0, long shift)
{
if (shift != 0)
return (a1 << shift) | (a0 >> (LIMB_BITS - shift));
else
return a1;
}
#define malloc(s) malloc_is_forbidden(s)
#define free(p) free_is_forbidden(p)
#define realloc(p, s) realloc_is_forbidden(p, s)
@ -236,7 +251,7 @@ int bf_set_ui(bf_t *r, uint64_t a)
a1 = a >> 32;
shift = clz(a1);
r->tab[0] = a0 << shift;
r->tab[1] = (a1 << shift) | (a0 >> (LIMB_BITS - shift));
r->tab[1] = shld(a1, a0, shift);
r->expn = 2 * LIMB_BITS - shift;
}
#endif
@ -5388,21 +5403,6 @@ int bf_acos(bf_t *r, const bf_t *a, limb_t prec, bf_flags_t flags)
#endif /* LIMB_BITS != 64 */
static inline __maybe_unused limb_t shrd(limb_t low, limb_t high, long shift)
{
if (shift != 0)
low = (low >> shift) | (high << (LIMB_BITS - shift));
return low;
}
static inline __maybe_unused limb_t shld(limb_t a1, limb_t a0, long shift)
{
if (shift != 0)
return (a1 << shift) | (a0 >> (LIMB_BITS - shift));
else
return a1;
}
#if LIMB_DIGITS == 19
/* WARNING: hardcoded for b = 1e19. It is assumed that: