sr-dev December 2021

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git:master:d6a34eee: core: reworked string-number conversion to catch out of limits values

by Daniel-Constantin Mierla

Module: kamailio Branch: master Commit: d6a34eee893a47450650ea29671e80dbffc03c8f URL: https://github.com/kamailio/kamailio/commit/d6a34eee893a47450650ea29671e80d… Author: Daniel-Constantin Mierla <miconda(a)gmail.com> Committer: Daniel-Constantin Mierla <miconda(a)gmail.com> Date: 2021-12-01T09:34:28+01:00 core: reworked string-number conversion to catch out of limits values --- Modified: src/core/ut.h --- Diff: https://github.com/kamailio/kamailio/commit/d6a34eee893a47450650ea29671e80d… Patch: https://github.com/kamailio/kamailio/commit/d6a34eee893a47450650ea29671e80d… --- diff --git a/src/core/ut.h b/src/core/ut.h index 9b899a94e7..44bd0e75c7 100644 --- a/src/core/ut.h +++ b/src/core/ut.h @@ -627,37 +627,43 @@ static inline void strlower(str* _s) } } - -#define str2unval(_s, _r, _vmax) do { \ - int i; \ - if (_r == NULL) return -1; \ +#define str2unval(_s, _r, _vtype, _vmax) do { \ + _vtype limitmul; \ + int i, c, limitrst; \ + if((_s == NULL) || (_r == NULL) || (_s->len < 0) || (_s->s == NULL)) { \ + return -1; \ + } \ *_r = 0; \ - if (_s == NULL) return -1; \ - if (_s->len < 0) return -1; \ - if (_s->s == NULL) return -1; \ - for(i = 0; i < _s->len; i++) { \ - if ((_s->s[i] >= '0') && (_s->s[i] <= '9')) { \ - if(*_r > _vmax/10) { \ - return -1; \ - } \ - *_r *= 10; \ - if(*_r > _vmax - (_s->s[i] - '0')) { \ - return -1; \ - } \ - *_r += _s->s[i] - '0'; \ - } else { \ + i = 0; \ + if (_s->s[0] == '+') { \ + i++; \ + } \ + limitmul = _vmax / 10; \ + limitrst = _vmax % 10; \ + for(; i < _s->len; i++) { \ + c = (unsigned char)_s->s[i]; \ + if (c < '0' || c > '9') { \ + return -1; \ + } \ + c -= '0'; \ + if (*_r > limitmul || (*_r == limitmul && c > limitrst)) { \ + *_r = _vmax; \ return -1; \ + } else { \ + *_r *= 10; \ + *_r += c; \ } \ } \ return 0; \ } while(0) + /* * Convert an str to unsigned long */ static inline int str2ulong(str* _s, unsigned long* _r) { - str2unval(_s, _r, ULONG_MAX); + str2unval(_s, _r, long, ULONG_MAX); } /* @@ -665,56 +671,69 @@ static inline int str2ulong(str* _s, unsigned long* _r) */ static inline int str2int(str* _s, unsigned int* _r) { - str2unval(_s, _r, UINT_MAX); + str2unval(_s, _r, int, UINT_MAX); } -#define str2snval(_s, _r, _vmin, _vmax) do { \ - int i; \ - int sign; \ - long long ll; \ - if (_s == NULL) return -1; \ - if (_r == NULL) return -1; \ - if (_s->len < 0) return -1; \ - if (_s->s == NULL) return -1; \ + +#define str2snval(_s, _r, _vtype, _vmin, _vmax) do { \ + _vtype limitmul; \ + int i, c, neg, limitrst; \ + if((_s == NULL) || (_r == NULL) || (_s->len < 0) || (_s->s == NULL)) { \ + return -1; \ + } \ *_r = 0; \ - sign = 1; \ + neg = 0; \ i = 0; \ if (_s->s[0] == '+') { \ i++; \ } else if (_s->s[0] == '-') { \ - sign = -1; \ + neg = 1; \ i++; \ } \ + limitmul = neg ? _vmin : _vmax; \ + limitrst = limitmul % 10; \ + limitmul /= 10; \ + if (neg) { \ + if (limitrst > 0) { \ + limitrst -= 10; \ + limitmul += 1; \ + } \ + limitrst = -limitrst; \ + } \ for(; i < _s->len; i++) { \ - if ((_s->s[i] >= '0') && (_s->s[i] <= '9')) { \ - if(*_r > _vmax/10) { \ + c = (unsigned char)_s->s[i]; \ + if (c < '0' || c > '9') { \ + return -1; \ + } \ + c -= '0'; \ + if (neg) { \ + if (*_r < limitmul || (*_r == limitmul && c > limitrst)) { \ + *_r = _vmin; \ return -1; \ + } else { \ + *_r *= 10; \ + *_r -= c; \ } \ - *_r *= 10; \ - if(*_r > _vmax - (_s->s[i] - '0')) { \ + } else { \ + if (*_r > limitmul || (*_r == limitmul && c > limitrst)) { \ + *_r = _vmax; \ return -1; \ + } else { \ + *_r *= 10; \ + *_r += c; \ } \ - *_r += _s->s[i] - '0'; \ - } else { \ - return -1; \ } \ } \ - if(sign < 0) { \ - ll = (long long)(*_r) * sign; \ - if(ll < _vmin) { \ - return -1; \ - } \ - *_r *= sign; \ - } \ return 0; \ } while(0) + /* * Convert an str to signed long */ static inline int str2slong(str* _s, long* _r) { - str2snval(_s, _r, LONG_MIN, LONG_MAX); + str2snval(_s, _r, long, LONG_MIN, LONG_MAX); } @@ -723,7 +742,7 @@ static inline int str2slong(str* _s, long* _r) */ static inline int str2sint(str* _s, int* _r) { - str2snval(_s, _r, INT_MIN, INT_MAX); + str2snval(_s, _r, int, INT_MIN, INT_MAX); }

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sr-dev December 2021