crypto/dsa/dsa_ossl.c:110: error: BUFFER_OVERRUN_L3
  Offset added: [8, +oo] Size: [0, 67108856] by call to `BN_sub`.
Showing all 23 steps of the trace


crypto/dsa/dsa_ossl.c:91:10: Call
89.           goto err;
90.    redo:
91.       if (!dsa_sign_setup(dsa, ctx, &kinv, &ret->r, dgst, dlen))
               ^
92.           goto err;
93.   

crypto/dsa/dsa_ossl.c:143:1: Parameter `(*rp)->top`
  141.   }
  142.   
  143. > static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in,
  144.                             BIGNUM **kinvp, BIGNUM **rp,
  145.                             const unsigned char *dgst, int dlen)

crypto/dsa/dsa_ossl.c:110:14: Call
108.           goto err;               /* s = m + xr */
109.       if (BN_cmp(ret->s, dsa->q) > 0)
110.           if (!BN_sub(ret->s, ret->s, dsa->q))
                    ^
111.               goto err;
112.       if (!BN_mod_mul(ret->s, ret->s, kinv, dsa->q, ctx))

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:54:15: Call
  52.       if (a->neg != b->neg) {
  53.           r_neg = a->neg;
  54.           ret = BN_uadd(r, a, b);
                      ^
  55.       } else {
  56.           cmp_res = BN_ucmp(a, b);

crypto/bn/bn_add.c:76:1: Parameter `r->top`
    74.   
    75.   /* unsigned add of b to a, r can be equal to a or b. */
    76. > int BN_uadd(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
    77.   {
    78.       int max, min, dif;

crypto/bn/bn_add.c:96:9: Call
    94.       dif = max - min;
    95.   
    96.       if (bn_wexpand(r, max + 1) == NULL)
                  ^
    97.           return 0;
    98.   

crypto/bn/bn_lib.c:910:1: Parameter `a->top`
      908.   }
      909.   
      910. > BIGNUM *bn_wexpand(BIGNUM *a, int words)
      911.   {
      912.       return (words <= a->dmax) ? a : bn_expand2(a, words);

crypto/bn/bn_lib.c:912:37: Call
      910.   BIGNUM *bn_wexpand(BIGNUM *a, int words)
      911.   {
      912.       return (words <= a->dmax) ? a : bn_expand2(a, words);
                                                 ^
      913.   }
      914.   

crypto/bn/bn_lib.c:246:1: Parameter `b->top`
        244.    */
        245.   
        246. > BIGNUM *bn_expand2(BIGNUM *b, int words)
        247.   {
        248.       bn_check_top(b);

crypto/bn/bn_lib.c:251:23: Call
        249.   
        250.       if (words > b->dmax) {
        251.           BN_ULONG *a = bn_expand_internal(b, words);
                                     ^
        252.           if (!a)
        253.               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:225:13: Call
          223.           a = OPENSSL_secure_zalloc(words * sizeof(*a));
          224.       else
          225.           a = OPENSSL_zalloc(words * sizeof(*a));
                             ^
          226.       if (a == NULL) {
          227.           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:225:9: Assignment
          223.           a = OPENSSL_secure_zalloc(words * sizeof(*a));
          224.       else
          225.           a = OPENSSL_zalloc(words * sizeof(*a));
                         ^
          226.       if (a == NULL) {
          227.           BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);

crypto/bn/bn_lib.c:233:9: Array access: Offset added: [8, +oo] Size: [0, 67108856] by call to `BN_sub` 
          231.       assert(b->top <= words);
          232.       if (b->top > 0)
          233.           memcpy(a, b->d, sizeof(*a) * b->top);
                         ^
          234.   
          235.       return a;

static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
{
    BN_ULONG *a = NULL;
    bn_check_top(b);
    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 DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa)\n{\n    BIGNUM *kinv = NULL;\n    BIGNUM *m;\n    BIGNUM *xr;\n    BN_CTX *ctx = NULL;\n    int reason = ERR_R_BN_LIB;\n    DSA_SIG *ret = NULL;\n    int rv = 0;\n    m = BN_new();\n    xr = BN_new();\n    if (m == NULL || xr == NULL)\n        goto err;\n    if (!dsa->p || !dsa->q || !dsa->g) {\n        reason = DSA_R_MISSING_PARAMETERS;\n        goto err;\n    }\n    ret = DSA_SIG_new();\n    if (ret == NULL)\n        goto err;\n    ret->r = BN_new();\n    ret->s = BN_new();\n    if (ret->r == NULL || ret->s == NULL)\n        goto err;\n    ctx = BN_CTX_new();\n    if (ctx == NULL)\n        goto err;\n redo:\n    if (!dsa_sign_setup(dsa, ctx, &kinv, &ret->r, dgst, dlen))\n        goto err;\n    if (dlen > BN_num_bytes(dsa->q))\n        dlen = BN_num_bytes(dsa->q);\n    if (BN_bin2bn(dgst, dlen, m) == NULL)\n        goto err;\n    if (!BN_mod_mul(xr, dsa->priv_key, ret->r, dsa->q, ctx))\n        goto err;\n    if (!BN_add(ret->s, xr, m))\n        goto err;\n    if (BN_cmp(ret->s, dsa->q) > 0)\n        if (!BN_sub(ret->s, ret->s, dsa->q))\n            goto err;\n    if (!BN_mod_mul(ret->s, ret->s, kinv, dsa->q, ctx))\n        goto err;\n    if (BN_is_zero(ret->r) || BN_is_zero(ret->s))\n        goto redo;\n    rv = 1;\n err:\n    if (rv == 0) {\n        DSAerr(DSA_F_DSA_DO_SIGN, reason);\n        DSA_SIG_free(ret);\n        ret = NULL;\n    }\n    BN_CTX_free(ctx);\n    BN_clear_free(m);\n    BN_clear_free(xr);\n    BN_clear_free(kinv);\n    return ret;\n}', 'static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in,\n                          BIGNUM **kinvp, BIGNUM **rp,\n                          const unsigned char *dgst, int dlen)\n{\n    BN_CTX *ctx = NULL;\n    BIGNUM *k, *kinv = NULL, *r = *rp;\n    BIGNUM *l, *m;\n    int ret = 0;\n    int q_bits;\n    if (!dsa->p || !dsa->q || !dsa->g) {\n        DSAerr(DSA_F_DSA_SIGN_SETUP, DSA_R_MISSING_PARAMETERS);\n        return 0;\n    }\n    k = BN_new();\n    l = BN_new();\n    m = BN_new();\n    if (k == NULL || l == NULL || m == NULL)\n        goto err;\n    if (ctx_in == NULL) {\n        if ((ctx = BN_CTX_new()) == NULL)\n            goto err;\n    } else\n        ctx = ctx_in;\n    q_bits = BN_num_bits(dsa->q);\n    if (!BN_set_bit(k, q_bits)\n        || !BN_set_bit(l, q_bits)\n        || !BN_set_bit(m, q_bits))\n        goto err;\n    do {\n        if (dgst != NULL) {\n            if (!BN_generate_dsa_nonce(k, dsa->q, dsa->priv_key, dgst,\n                                       dlen, ctx))\n                goto err;\n        } else if (!BN_priv_rand_range(k, dsa->q))\n            goto err;\n    } while (BN_is_zero(k));\n    BN_set_flags(k, BN_FLG_CONSTTIME);\n    if (dsa->flags & DSA_FLAG_CACHE_MONT_P) {\n        if (!BN_MONT_CTX_set_locked(&dsa->method_mont_p,\n                                    dsa->lock, dsa->p, ctx))\n            goto err;\n    }\n    if (!BN_add(l, k, dsa->q)\n        || !BN_add(m, l, dsa->q)\n        || !BN_copy(k, BN_num_bits(l) > q_bits ? l : m))\n        goto err;\n    if ((dsa)->meth->bn_mod_exp != NULL) {\n            if (!dsa->meth->bn_mod_exp(dsa, r, dsa->g, k, dsa->p, ctx,\n                                       dsa->method_mont_p))\n                goto err;\n    } else {\n            if (!BN_mod_exp_mont(r, dsa->g, k, dsa->p, ctx, dsa->method_mont_p))\n                goto err;\n    }\n    if (!BN_mod(r, r, dsa->q, ctx))\n        goto err;\n    if ((kinv = BN_mod_inverse(NULL, k, dsa->q, ctx)) == NULL)\n        goto err;\n    BN_clear_free(*kinvp);\n    *kinvp = kinv;\n    kinv = NULL;\n    ret = 1;\n err:\n    if (!ret)\n        DSAerr(DSA_F_DSA_SIGN_SETUP, ERR_R_BN_LIB);\n    if (ctx != ctx_in)\n        BN_CTX_free(ctx);\n    BN_clear_free(k);\n    BN_clear_free(l);\n    BN_clear_free(m);\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_uadd(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)\n{\n    int max, min, dif;\n    const BN_ULONG *ap, *bp;\n    BN_ULONG *rp, carry, t1, t2;\n    bn_check_top(a);\n    bn_check_top(b);\n    if (a->top < b->top) {\n        const BIGNUM *tmp;\n        tmp = a;\n        a = b;\n        b = tmp;\n    }\n    max = a->top;\n    min = b->top;\n    dif = max - min;\n    if (bn_wexpand(r, max + 1) == NULL)\n        return 0;\n    r->top = max;\n    ap = a->d;\n    bp = b->d;\n    rp = r->d;\n    carry = bn_add_words(rp, ap, bp, min);\n    rp += min;\n    ap += min;\n    while (dif) {\n        dif--;\n        t1 = *(ap++);\n        t2 = (t1 + carry) & BN_MASK2;\n        *(rp++) = t2;\n        carry &= (t2 == 0);\n    }\n    *rp = carry;\n    r->top += carry;\n    r->neg = 0;\n    bn_check_top(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    bn_check_top(b);\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    bn_check_top(b);\n    return b;\n}', 'static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)\n{\n    BN_ULONG *a = NULL;\n    bn_check_top(b);\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}']