crypto/rsa/rsa_ossl.c:347: error: BUFFER_OVERRUN_L3
  Offset added: [8, +oo] Size: [0, 67108856] by call to `BN_sub`.
Showing all 23 steps of the trace


crypto/rsa/rsa_ossl.c:284:9: Call
282.           goto err;
283.   
284.       if (BN_bin2bn(buf, num, f) == NULL)
               ^
285.           goto err;
286.   

crypto/bn/bn_lib.c:371:1: Parameter `ret->top`
  369.   }
  370.   
  371. > BIGNUM *BN_bin2bn(const unsigned char *s, int len, BIGNUM *ret)
  372.   {
  373.       unsigned int i, m;

crypto/rsa/rsa_ossl.c:347:9: Call
345.   
346.       if (padding == RSA_X931_PADDING) {
347.           BN_sub(f, rsa->n, ret);
               ^
348.           if (BN_cmp(ret, f) > 0)
349.               res = f;

crypto/bn/bn_add.c:45:1: Parameter `r->top`
  43.   
  44.   /* signed sub of b from a. */
  45. > int BN_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
  46.   {
  47.       int ret, r_neg, cmp_res;

crypto/bn/bn_add.c:62:19: Call
  60.           } else if (cmp_res < 0) {
  61.               r_neg = !b->neg;
  62.               ret = BN_usub(r, b, a);
                          ^
  63.           } else {
  64.               r_neg = 0;

crypto/bn/bn_add.c:125:1: Parameter `r->top`
    123.   
    124.   /* unsigned subtraction of b from a, a must be larger than b. */
    125. > int BN_usub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
    126.   {
    127.       int max, min, dif;

crypto/bn/bn_add.c:143:9: Call
    141.       }
    142.   
    143.       if (bn_wexpand(r, max) == NULL)
                   ^
    144.           return 0;
    145.   

crypto/bn/bn_lib.c:942:1: Parameter `a->top`
      940.   }
      941.   
      942. > BIGNUM *bn_wexpand(BIGNUM *a, int words)
      943.   {
      944.       return (words <= a->dmax) ? a : bn_expand2(a, words);

crypto/bn/bn_lib.c:944:37: Call
      942.   BIGNUM *bn_wexpand(BIGNUM *a, int words)
      943.   {
      944.       return (words <= a->dmax) ? a : bn_expand2(a, words);
                                                 ^
      945.   }
      946.   

crypto/bn/bn_lib.c:244:1: Parameter `b->top`
        242.    */
        243.   
        244. > BIGNUM *bn_expand2(BIGNUM *b, int words)
        245.   {
        246.       if (words > b->dmax) {

crypto/bn/bn_lib.c:247:23: Call
        245.   {
        246.       if (words > b->dmax) {
        247.           BN_ULONG *a = bn_expand_internal(b, words);
                                     ^
        248.           if (!a)
        249.               return NULL;

crypto/bn/bn_lib.c:208:1: <Offset trace>
206.   /* This is used by bn_expand2() */
207.   /* The caller MUST check that words > b->dmax before calling this */
208. > static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
209.   {
210.       BN_ULONG *a = NULL;

crypto/bn/bn_lib.c:208:1: Parameter `b->top`
          206.   /* This is used by bn_expand2() */
          207.   /* The caller MUST check that words > b->dmax before calling this */
          208. > static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
          209.   {
          210.       BN_ULONG *a = NULL;

crypto/bn/bn_lib.c:208:1: <Length trace>
206.   /* This is used by bn_expand2() */
207.   /* The caller MUST check that words > b->dmax before calling this */
208. > static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
209.   {
210.       BN_ULONG *a = NULL;

crypto/bn/bn_lib.c:208:1: Parameter `words`
          206.   /* This is used by bn_expand2() */
          207.   /* The caller MUST check that words > b->dmax before calling this */
          208. > static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
          209.   {
          210.       BN_ULONG *a = NULL;

crypto/bn/bn_lib.c:223:13: Call
          221.           a = OPENSSL_secure_zalloc(words * sizeof(*a));
          222.       else
          223.           a = OPENSSL_zalloc(words * sizeof(*a));
                             ^
          224.       if (a == NULL) {
          225.           BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);

crypto/mem.c:228:1: Parameter `num`
            226.   }
            227.   
            228. > void *CRYPTO_zalloc(size_t num, const char *file, int line)
            229.   {
            230.       void *ret = CRYPTO_malloc(num, file, line);

crypto/mem.c:230:17: Call
            228.   void *CRYPTO_zalloc(size_t num, const char *file, int line)
            229.   {
            230.       void *ret = CRYPTO_malloc(num, file, line);
                                   ^
            231.   
            232.       FAILTEST();

crypto/mem.c:201:9: Assignment
              199.   
              200.       if (num == 0)
              201.           return NULL;
                             ^
              202.   
              203.       FAILTEST();

crypto/mem.c:230:5: Assignment
            228.   void *CRYPTO_zalloc(size_t num, const char *file, int line)
            229.   {
            230.       void *ret = CRYPTO_malloc(num, file, line);
                       ^
            231.   
            232.       FAILTEST();

crypto/mem.c:235:5: Assignment
            233.       if (ret != NULL)
            234.           memset(ret, 0, num);
            235.       return ret;
                       ^
            236.   }
            237.   

crypto/bn/bn_lib.c:223:9: Assignment
          221.           a = OPENSSL_secure_zalloc(words * sizeof(*a));
          222.       else
          223.           a = OPENSSL_zalloc(words * sizeof(*a));
                         ^
          224.       if (a == NULL) {
          225.           BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);

crypto/bn/bn_lib.c:231:9: Array access: Offset added: [8, +oo] Size: [0, 67108856] by call to `BN_sub` 
          229.       assert(b->top <= words);
          230.       if (b->top > 0)
          231.           memcpy(a, b->d, sizeof(*a) * b->top);
                         ^
          232.   
          233.       return a;

static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
{
    BN_ULONG *a = NULL;
    if (words > (INT_MAX / (4 * BN_BITS2))) {
        BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_BIGNUM_TOO_LONG);
        return NULL;
    }
    if (BN_get_flags(b, BN_FLG_STATIC_DATA)) {
        BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_EXPAND_ON_STATIC_BIGNUM_DATA);
        return NULL;
    }
    if (BN_get_flags(b, BN_FLG_SECURE))
        a = OPENSSL_secure_zalloc(words * sizeof(*a));
    else
        a = OPENSSL_zalloc(words * sizeof(*a));
    if (a == NULL) {
        BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);
        return NULL;
    }
    assert(b->top <= words);
    if (b->top > 0)
        memcpy(a, b->d, sizeof(*a) * b->top);
    return a;
}
['static int rsa_ossl_private_encrypt(int flen, const unsigned char *from,\n                                   unsigned char *to, RSA *rsa, int padding)\n{\n    BIGNUM *f, *ret, *res;\n    int i, j, k, num = 0, r = -1;\n    unsigned char *buf = NULL;\n    BN_CTX *ctx = NULL;\n    int local_blinding = 0;\n    BIGNUM *unblind = NULL;\n    BN_BLINDING *blinding = NULL;\n    if ((ctx = BN_CTX_new()) == NULL)\n        goto err;\n    BN_CTX_start(ctx);\n    f = BN_CTX_get(ctx);\n    ret = BN_CTX_get(ctx);\n    num = BN_num_bytes(rsa->n);\n    buf = OPENSSL_malloc(num);\n    if (ret == NULL || buf == NULL) {\n        RSAerr(RSA_F_RSA_OSSL_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);\n        goto err;\n    }\n    switch (padding) {\n    case RSA_PKCS1_PADDING:\n        i = RSA_padding_add_PKCS1_type_1(buf, num, from, flen);\n        break;\n    case RSA_X931_PADDING:\n        i = RSA_padding_add_X931(buf, num, from, flen);\n        break;\n    case RSA_NO_PADDING:\n        i = RSA_padding_add_none(buf, num, from, flen);\n        break;\n    case RSA_SSLV23_PADDING:\n    default:\n        RSAerr(RSA_F_RSA_OSSL_PRIVATE_ENCRYPT, RSA_R_UNKNOWN_PADDING_TYPE);\n        goto err;\n    }\n    if (i <= 0)\n        goto err;\n    if (BN_bin2bn(buf, num, f) == NULL)\n        goto err;\n    if (BN_ucmp(f, rsa->n) >= 0) {\n        RSAerr(RSA_F_RSA_OSSL_PRIVATE_ENCRYPT,\n               RSA_R_DATA_TOO_LARGE_FOR_MODULUS);\n        goto err;\n    }\n    if (!(rsa->flags & RSA_FLAG_NO_BLINDING)) {\n        blinding = rsa_get_blinding(rsa, &local_blinding, ctx);\n        if (blinding == NULL) {\n            RSAerr(RSA_F_RSA_OSSL_PRIVATE_ENCRYPT, ERR_R_INTERNAL_ERROR);\n            goto err;\n        }\n    }\n    if (blinding != NULL) {\n        if (!local_blinding && ((unblind = BN_CTX_get(ctx)) == NULL)) {\n            RSAerr(RSA_F_RSA_OSSL_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);\n            goto err;\n        }\n        if (!rsa_blinding_convert(blinding, f, unblind, ctx))\n            goto err;\n    }\n    if ((rsa->flags & RSA_FLAG_EXT_PKEY) ||\n        (rsa->version == RSA_ASN1_VERSION_MULTI) ||\n        ((rsa->p != NULL) &&\n         (rsa->q != NULL) &&\n         (rsa->dmp1 != NULL) && (rsa->dmq1 != NULL) && (rsa->iqmp != NULL))) {\n        if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx))\n            goto err;\n    } else {\n        BIGNUM *d = BN_new();\n        if (d == NULL) {\n            RSAerr(RSA_F_RSA_OSSL_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);\n            goto err;\n        }\n        BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);\n        if (rsa->flags & RSA_FLAG_CACHE_PUBLIC)\n            if (!BN_MONT_CTX_set_locked\n                (&rsa->_method_mod_n, rsa->lock, rsa->n, ctx)) {\n                BN_free(d);\n                goto err;\n            }\n        if (!rsa->meth->bn_mod_exp(ret, f, d, rsa->n, ctx,\n                                   rsa->_method_mod_n)) {\n            BN_free(d);\n            goto err;\n        }\n        BN_free(d);\n    }\n    if (blinding)\n        if (!rsa_blinding_invert(blinding, ret, unblind, ctx))\n            goto err;\n    if (padding == RSA_X931_PADDING) {\n        BN_sub(f, rsa->n, ret);\n        if (BN_cmp(ret, f) > 0)\n            res = f;\n        else\n            res = ret;\n    } else {\n        res = ret;\n    }\n    j = BN_num_bytes(res);\n    i = BN_bn2bin(res, &(to[num - j]));\n    for (k = 0; k < (num - i); k++)\n        to[k] = 0;\n    r = num;\n err:\n    if (ctx != NULL)\n        BN_CTX_end(ctx);\n    BN_CTX_free(ctx);\n    OPENSSL_clear_free(buf, num);\n    return r;\n}', 'BIGNUM *BN_bin2bn(const unsigned char *s, int len, BIGNUM *ret)\n{\n    unsigned int i, m;\n    unsigned int n;\n    BN_ULONG l;\n    BIGNUM *bn = NULL;\n    if (ret == NULL)\n        ret = bn = BN_new();\n    if (ret == NULL)\n        return NULL;\n    bn_check_top(ret);\n    for ( ; len > 0 && *s == 0; s++, len--)\n        continue;\n    n = len;\n    if (n == 0) {\n        ret->top = 0;\n        return ret;\n    }\n    i = ((n - 1) / BN_BYTES) + 1;\n    m = ((n - 1) % (BN_BYTES));\n    if (bn_wexpand(ret, (int)i) == NULL) {\n        BN_free(bn);\n        return NULL;\n    }\n    ret->top = i;\n    ret->neg = 0;\n    l = 0;\n    while (n--) {\n        l = (l << 8L) | *(s++);\n        if (m-- == 0) {\n            ret->d[--i] = l;\n            l = 0;\n            m = BN_BYTES - 1;\n        }\n    }\n    bn_correct_top(ret);\n    return ret;\n}', 'int BN_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)\n{\n    int ret, r_neg, cmp_res;\n    bn_check_top(a);\n    bn_check_top(b);\n    if (a->neg != b->neg) {\n        r_neg = a->neg;\n        ret = BN_uadd(r, a, b);\n    } else {\n        cmp_res = BN_ucmp(a, b);\n        if (cmp_res > 0) {\n            r_neg = a->neg;\n            ret = BN_usub(r, a, b);\n        } else if (cmp_res < 0) {\n            r_neg = !b->neg;\n            ret = BN_usub(r, b, a);\n        } else {\n            r_neg = 0;\n            BN_zero(r);\n            ret = 1;\n        }\n    }\n    r->neg = r_neg;\n    bn_check_top(r);\n    return ret;\n}', 'int BN_usub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)\n{\n    int max, min, dif;\n    BN_ULONG t1, t2, borrow, *rp;\n    const BN_ULONG *ap, *bp;\n    bn_check_top(a);\n    bn_check_top(b);\n    max = a->top;\n    min = b->top;\n    dif = max - min;\n    if (dif < 0) {\n        BNerr(BN_F_BN_USUB, BN_R_ARG2_LT_ARG3);\n        return 0;\n    }\n    if (bn_wexpand(r, max) == NULL)\n        return 0;\n    ap = a->d;\n    bp = b->d;\n    rp = r->d;\n    borrow = bn_sub_words(rp, ap, bp, min);\n    ap += min;\n    rp += min;\n    while (dif) {\n        dif--;\n        t1 = *(ap++);\n        t2 = (t1 - borrow) & BN_MASK2;\n        *(rp++) = t2;\n        borrow &= (t1 == 0);\n    }\n    while (max && *--rp == 0)\n        max--;\n    r->top = max;\n    r->neg = 0;\n    bn_pollute(r);\n    return 1;\n}', 'BIGNUM *bn_wexpand(BIGNUM *a, int words)\n{\n    return (words <= a->dmax) ? a : bn_expand2(a, words);\n}', 'BIGNUM *bn_expand2(BIGNUM *b, int words)\n{\n    if (words > b->dmax) {\n        BN_ULONG *a = bn_expand_internal(b, words);\n        if (!a)\n            return NULL;\n        if (b->d) {\n            OPENSSL_cleanse(b->d, b->dmax * sizeof(b->d[0]));\n            bn_free_d(b);\n        }\n        b->d = a;\n        b->dmax = words;\n    }\n    return b;\n}', 'static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)\n{\n    BN_ULONG *a = NULL;\n    if (words > (INT_MAX / (4 * BN_BITS2))) {\n        BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_BIGNUM_TOO_LONG);\n        return NULL;\n    }\n    if (BN_get_flags(b, BN_FLG_STATIC_DATA)) {\n        BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_EXPAND_ON_STATIC_BIGNUM_DATA);\n        return NULL;\n    }\n    if (BN_get_flags(b, BN_FLG_SECURE))\n        a = OPENSSL_secure_zalloc(words * sizeof(*a));\n    else\n        a = OPENSSL_zalloc(words * sizeof(*a));\n    if (a == NULL) {\n        BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);\n        return NULL;\n    }\n    assert(b->top <= words);\n    if (b->top > 0)\n        memcpy(a, b->d, sizeof(*a) * b->top);\n    return a;\n}', 'void *CRYPTO_zalloc(size_t num, const char *file, int line)\n{\n    void *ret = CRYPTO_malloc(num, file, line);\n    FAILTEST();\n    if (ret != NULL)\n        memset(ret, 0, num);\n    return ret;\n}', 'void *CRYPTO_malloc(size_t num, const char *file, int line)\n{\n    void *ret = NULL;\n    INCREMENT(malloc_count);\n    if (malloc_impl != NULL && malloc_impl != CRYPTO_malloc)\n        return malloc_impl(num, file, line);\n    if (num == 0)\n        return NULL;\n    FAILTEST();\n    if (allow_customize) {\n        allow_customize = 0;\n    }\n#ifndef OPENSSL_NO_CRYPTO_MDEBUG\n    if (call_malloc_debug) {\n        CRYPTO_mem_debug_malloc(NULL, num, 0, file, line);\n        ret = malloc(num);\n        CRYPTO_mem_debug_malloc(ret, num, 1, file, line);\n    } else {\n        ret = malloc(num);\n    }\n#else\n    (void)(file); (void)(line);\n    ret = malloc(num);\n#endif\n    return ret;\n}']