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String buffers, part 4b: Improve de-serialization checks.

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Sponsored by fmad.io.
This commit is contained in:
Mike Pall 2021-08-12 21:28:17 +02:00
parent 15ed84bd49
commit 8ff09d9f5a
1 changed files with 13 additions and 3 deletions
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16
src/lj_serialize.c
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@ -355,13 +355,13 @@ static char *serialize_get(char *r, SBufExt *sbx, TValue *o)
#if LJ_BE
o->u64 = lj_bswap64(o->u64);
#endif
if (!tvisnum(o)) setnanV(o);
if (!tvisnum(o)) setnanV(o); /* Fix non-canonical NaNs. */
} else if (tp <= SER_TAG_TRUE) {
setpriV(o, ~tp);
} else if (tp == SER_TAG_DICT_STR) {
GCtab *dict_str;
uint32_t idx;
r = serialize_ru124(r, w, &idx);
r = serialize_ru124(r, w, &idx); if (LJ_UNLIKELY(!r)) goto eob;
idx++;
dict_str = tabref(sbx->dict_str);
if (dict_str && idx < dict_str->asize && tvisstr(arrayslot(dict_str, idx)))
@ -371,6 +371,8 @@ static char *serialize_get(char *r, SBufExt *sbx, TValue *o)
} else if (tp >= SER_TAG_TAB && tp <= SER_TAG_DICT_MT) {
uint32_t narray = 0, nhash = 0;
GCtab *t, *mt = NULL;
if (sbx->depth <= 0) lj_err_caller(sbufL(sbx), LJ_ERR_BUFFER_DEPTH);
sbx->depth--;
if (tp == SER_TAG_DICT_MT) {
GCtab *dict_mt;
uint32_t idx;
@ -409,6 +411,7 @@ static char *serialize_get(char *r, SBufExt *sbx, TValue *o)
r = serialize_get(r, sbx, v);
} while (--nhash);
}
sbx->depth++;
#if LJ_HASFFI
} else if (tp >= SER_TAG_INT64 && tp <= SER_TAG_COMPLEX) {
uint32_t sz = tp == SER_TAG_COMPLEX ? 16 : 8;
@ -424,6 +427,11 @@ static char *serialize_get(char *r, SBufExt *sbx, TValue *o)
if (sz == 16)
((uint64_t *)cdataptr(cd))[1] = lj_bswap64(((uint64_t *)cdataptr(cd))[1]);
#endif
if (sz == 16) { /* Fix non-canonical NaNs. */
TValue *cdo = (TValue *)cdataptr(cd);
if (!tvisnum(&cdo[0])) setnanV(&cdo[0]);
if (!tvisnum(&cdo[1])) setnanV(&cdo[1]);
}
setcdataV(sbufL(sbx), o, cd);
#endif
} else if (tp <= (LJ_64 ? SER_TAG_LIGHTUD64 : SER_TAG_LIGHTUD32)) {
@ -468,6 +476,7 @@ SBufExt * LJ_FASTCALL lj_serialize_put(SBufExt *sbx, cTValue *o)
/* Decode from buffer. */
char * LJ_FASTCALL lj_serialize_get(SBufExt *sbx, TValue *o)
{
sbx->depth = LJ_SERIALIZE_DEPTH;
return serialize_get(sbx->r, sbx, o);
}
@ -491,7 +500,8 @@ void lj_serialize_decode(lua_State *L, TValue *o, GCstr *str)
memset(&sbx, 0, sizeof(SBufExt));
lj_bufx_set_cow(L, &sbx, strdata(str), str->len);
/* No need to set sbx.cowref here. */
r = lj_serialize_get(&sbx, o);
sbx.depth = LJ_SERIALIZE_DEPTH;
r = serialize_get(sbx.r, &sbx, o);
if (r != sbx.w) lj_err_caller(L, LJ_ERR_BUFFER_LEFTOV);
}