crypto/dh/dh_key.c:178: error: BUFFER_OVERRUN_L3
  Offset added: [8, +oo] Size: [0, 67108856] by call to `DH_check_pub_key`.
Showing all 24 steps of the trace


crypto/dh/dh_key.c:144:1: Parameter `dh->p->top`
142.   }
143.   
144. > static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
145.   {
146.       BN_CTX *ctx = NULL;

crypto/dh/dh_key.c:152:9: Call
150.       int check_result;
151.   
152.       if (BN_num_bits(dh->p) > OPENSSL_DH_MAX_MODULUS_BITS) {
               ^
153.           DHerr(DH_F_COMPUTE_KEY, DH_R_MODULUS_TOO_LARGE);
154.           goto err;

crypto/bn/bn_lib.c:166:9: Call
  164.       bn_check_top(a);
  165.   
  166.       if (BN_is_zero(a))
                 ^
  167.           return 0;
  168.       return ((i * BN_BITS2) + BN_num_bits_word(a->d[i]));

crypto/bn/bn_lib.c:852:1: Parameter `a->top`
    850.   }
    851.   
    852. > int BN_is_zero(const BIGNUM *a)
    853.   {
    854.       return a->top == 0;

crypto/dh/dh_key.c:178:10: Call
176.       }
177.   
178.       if (!DH_check_pub_key(dh, pub_key, &check_result) || check_result) {
                ^
179.           DHerr(DH_F_COMPUTE_KEY, DH_R_INVALID_PUBKEY);
180.           goto err;

crypto/dh/dh_check.c:147:1: Parameter `dh->p->top`
  145.   }
  146.   
  147. > int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *ret)
  148.   {
  149.       int ok = 0;

crypto/dh/dh_check.c:163:9: Call
  161.       if (BN_cmp(pub_key, tmp) <= 0)
  162.           *ret |= DH_CHECK_PUBKEY_TOO_SMALL;
  163.       if (BN_copy(tmp, dh->p) == NULL || !BN_sub_word(tmp, 1))
                 ^
  164.           goto err;
  165.       if (BN_cmp(pub_key, tmp) >= 0)

crypto/bn/bn_lib.c:323:1: Parameter `b->top`
    321.   }
    322.   
    323. > BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)
    324.   {
    325.       bn_check_top(b);

crypto/dh/dh_check.c:170:14: Call
  168.       if (dh->q != NULL) {
  169.           /* Check pub_key^q == 1 mod p */
  170.           if (!BN_mod_exp(tmp, pub_key, dh->q, dh->p, ctx))
                      ^
  171.               goto err;
  172.           if (!BN_is_one(tmp))

crypto/bn/bn_exp.c:91:1: Parameter `m->top`
    89.   }
    90.   
    91. > int BN_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, const BIGNUM *m,
    92.                  BN_CTX *ctx)
    93.   {

crypto/bn/bn_exp.c:136:9: Call
    134.   
    135.   #ifdef MONT_MUL_MOD
    136.       if (BN_is_odd(m)) {
                   ^
    137.   # ifdef MONT_EXP_WORD
    138.           if (a->top == 1 && !a->neg

crypto/bn/bn_lib.c:867:1: Parameter `a->top`
      865.   }
      866.   
      867. > int BN_is_odd(const BIGNUM *a)
      868.   {
      869.       return (a->top > 0) && (a->d[0] & 1);

crypto/bn/bn_exp.c:149:15: Call
    147.   #ifdef RECP_MUL_MOD
    148.       {
    149.           ret = BN_mod_exp_recp(r, a, p, m, ctx);
                         ^
    150.       }
    151.   #else

crypto/bn/bn_exp.c:161:1: Parameter `m->top`
      159.   }
      160.   
      161. > int BN_mod_exp_recp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
      162.                       const BIGNUM *m, BN_CTX *ctx)
      163.   {

crypto/bn/bn_exp.c:204:13: Call
      202.               goto err;
      203.       } else {
      204.           if (BN_RECP_CTX_set(&recp, m, ctx) <= 0)
                         ^
      205.               goto err;
      206.       }

crypto/bn/bn_recp.c:44:1: Parameter `d->top`
        42.   }
        43.   
        44. > int BN_RECP_CTX_set(BN_RECP_CTX *recp, const BIGNUM *d, BN_CTX *ctx)
        45.   {
        46.       if (!BN_copy(&(recp->N), d))

crypto/bn/bn_recp.c:46:10: Call
        44.   int BN_RECP_CTX_set(BN_RECP_CTX *recp, const BIGNUM *d, BN_CTX *ctx)
        45.   {
        46.       if (!BN_copy(&(recp->N), d))
                       ^
        47.           return 0;
        48.       BN_zero(&(recp->Nr));

crypto/bn/bn_lib.c:323:1: <Offset trace>
321.   }
322.   
323. > BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)
324.   {
325.       bn_check_top(b);

crypto/bn/bn_lib.c:323:1: Parameter `b->top`
          321.   }
          322.   
          323. > BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)
          324.   {
          325.       bn_check_top(b);

crypto/bn/bn_lib.c:323:1: <Length trace>
321.   }
322.   
323. > BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)
324.   {
325.       bn_check_top(b);

crypto/bn/bn_lib.c:323:1: Parameter `*a->d`
          321.   }
          322.   
          323. > BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)
          324.   {
          325.       bn_check_top(b);

crypto/bn/bn_lib.c:329:9: Call
          327.       if (a == b)
          328.           return a;
          329.       if (bn_wexpand(a, b->top) == NULL)
                         ^
          330.           return NULL;
          331.   

crypto/bn/bn_lib.c:948:1: Parameter `*a->d`
            946.   }
            947.   
            948. > BIGNUM *bn_wexpand(BIGNUM *a, int words)
            949.   {
            950.       return (words <= a->dmax) ? a : bn_expand2(a, words);

crypto/bn/bn_lib.c:333:9: Array access: Offset added: [8, +oo] Size: [0, 67108856] by call to `DH_check_pub_key` 
          331.   
          332.       if (b->top > 0)
          333.           memcpy(a->d, b->d, sizeof(b->d[0]) * b->top);
                         ^
          334.   
          335.       a->top = b->top;

BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)
{
    bn_check_top(b);
    if (a == b)
        return a;
    if (bn_wexpand(a, b->top) == NULL)
        return NULL;
    if (b->top > 0)
        memcpy(a->d, b->d, sizeof(b->d[0]) * b->top);
    a->top = b->top;
    a->neg = b->neg;
    bn_check_top(a);
    return a;
}
['static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)\n{\n    BN_CTX *ctx = NULL;\n    BN_MONT_CTX *mont = NULL;\n    BIGNUM *tmp;\n    int ret = -1;\n    int check_result;\n    if (BN_num_bits(dh->p) > OPENSSL_DH_MAX_MODULUS_BITS) {\n        DHerr(DH_F_COMPUTE_KEY, DH_R_MODULUS_TOO_LARGE);\n        goto err;\n    }\n    ctx = BN_CTX_new();\n    if (ctx == NULL)\n        goto err;\n    BN_CTX_start(ctx);\n    tmp = BN_CTX_get(ctx);\n    if (tmp == NULL)\n        goto err;\n    if (dh->priv_key == NULL) {\n        DHerr(DH_F_COMPUTE_KEY, DH_R_NO_PRIVATE_VALUE);\n        goto err;\n    }\n    if (dh->flags & DH_FLAG_CACHE_MONT_P) {\n        mont = BN_MONT_CTX_set_locked(&dh->method_mont_p,\n                                      dh->lock, dh->p, ctx);\n        BN_set_flags(dh->priv_key, BN_FLG_CONSTTIME);\n        if (!mont)\n            goto err;\n    }\n    if (!DH_check_pub_key(dh, pub_key, &check_result) || check_result) {\n        DHerr(DH_F_COMPUTE_KEY, DH_R_INVALID_PUBKEY);\n        goto err;\n    }\n    if (!dh->\n        meth->bn_mod_exp(dh, tmp, pub_key, dh->priv_key, dh->p, ctx, mont)) {\n        DHerr(DH_F_COMPUTE_KEY, ERR_R_BN_LIB);\n        goto err;\n    }\n    ret = BN_bn2bin(tmp, key);\n err:\n    if (ctx != NULL) {\n        BN_CTX_end(ctx);\n        BN_CTX_free(ctx);\n    }\n    return (ret);\n}', 'int BN_num_bits(const BIGNUM *a)\n{\n    int i = a->top - 1;\n    bn_check_top(a);\n    if (BN_is_zero(a))\n        return 0;\n    return ((i * BN_BITS2) + BN_num_bits_word(a->d[i]));\n}', 'int BN_is_zero(const BIGNUM *a)\n{\n    return a->top == 0;\n}', 'int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *ret)\n{\n    int ok = 0;\n    BIGNUM *tmp = NULL;\n    BN_CTX *ctx = NULL;\n    *ret = 0;\n    ctx = BN_CTX_new();\n    if (ctx == NULL)\n        goto err;\n    BN_CTX_start(ctx);\n    tmp = BN_CTX_get(ctx);\n    if (tmp == NULL || !BN_set_word(tmp, 1))\n        goto err;\n    if (BN_cmp(pub_key, tmp) <= 0)\n        *ret |= DH_CHECK_PUBKEY_TOO_SMALL;\n    if (BN_copy(tmp, dh->p) == NULL || !BN_sub_word(tmp, 1))\n        goto err;\n    if (BN_cmp(pub_key, tmp) >= 0)\n        *ret |= DH_CHECK_PUBKEY_TOO_LARGE;\n    if (dh->q != NULL) {\n        if (!BN_mod_exp(tmp, pub_key, dh->q, dh->p, ctx))\n            goto err;\n        if (!BN_is_one(tmp))\n            *ret |= DH_CHECK_PUBKEY_INVALID;\n    }\n    ok = 1;\n err:\n    if (ctx != NULL) {\n        BN_CTX_end(ctx);\n        BN_CTX_free(ctx);\n    }\n    return (ok);\n}', 'BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)\n{\n    bn_check_top(b);\n    if (a == b)\n        return a;\n    if (bn_wexpand(a, b->top) == NULL)\n        return NULL;\n    if (b->top > 0)\n        memcpy(a->d, b->d, sizeof(b->d[0]) * b->top);\n    a->top = b->top;\n    a->neg = b->neg;\n    bn_check_top(a);\n    return a;\n}', 'int BN_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, const BIGNUM *m,\n               BN_CTX *ctx)\n{\n    int ret;\n    bn_check_top(a);\n    bn_check_top(p);\n    bn_check_top(m);\n#define MONT_MUL_MOD\n#define MONT_EXP_WORD\n#define RECP_MUL_MOD\n#ifdef MONT_MUL_MOD\n    if (BN_is_odd(m)) {\n# ifdef MONT_EXP_WORD\n        if (a->top == 1 && !a->neg\n            && (BN_get_flags(p, BN_FLG_CONSTTIME) == 0)) {\n            BN_ULONG A = a->d[0];\n            ret = BN_mod_exp_mont_word(r, A, p, m, ctx, NULL);\n        } else\n# endif\n            ret = BN_mod_exp_mont(r, a, p, m, ctx, NULL);\n    } else\n#endif\n#ifdef RECP_MUL_MOD\n    {\n        ret = BN_mod_exp_recp(r, a, p, m, ctx);\n    }\n#else\n    {\n        ret = BN_mod_exp_simple(r, a, p, m, ctx);\n    }\n#endif\n    bn_check_top(r);\n    return (ret);\n}', 'int BN_is_odd(const BIGNUM *a)\n{\n    return (a->top > 0) && (a->d[0] & 1);\n}', 'int BN_mod_exp_recp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,\n                    const BIGNUM *m, BN_CTX *ctx)\n{\n    int i, j, bits, ret = 0, wstart, wend, window, wvalue;\n    int start = 1;\n    BIGNUM *aa;\n    BIGNUM *val[TABLE_SIZE];\n    BN_RECP_CTX recp;\n    if (BN_get_flags(p, BN_FLG_CONSTTIME) != 0) {\n        BNerr(BN_F_BN_MOD_EXP_RECP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);\n        return 0;\n    }\n    bits = BN_num_bits(p);\n    if (bits == 0) {\n        if (BN_is_one(m)) {\n            ret = 1;\n            BN_zero(r);\n        } else {\n            ret = BN_one(r);\n        }\n        return ret;\n    }\n    BN_CTX_start(ctx);\n    aa = BN_CTX_get(ctx);\n    val[0] = BN_CTX_get(ctx);\n    if (!aa || !val[0])\n        goto err;\n    BN_RECP_CTX_init(&recp);\n    if (m->neg) {\n        if (!BN_copy(aa, m))\n            goto err;\n        aa->neg = 0;\n        if (BN_RECP_CTX_set(&recp, aa, ctx) <= 0)\n            goto err;\n    } else {\n        if (BN_RECP_CTX_set(&recp, m, ctx) <= 0)\n            goto err;\n    }\n    if (!BN_nnmod(val[0], a, m, ctx))\n        goto err;\n    if (BN_is_zero(val[0])) {\n        BN_zero(r);\n        ret = 1;\n        goto err;\n    }\n    window = BN_window_bits_for_exponent_size(bits);\n    if (window > 1) {\n        if (!BN_mod_mul_reciprocal(aa, val[0], val[0], &recp, ctx))\n            goto err;\n        j = 1 << (window - 1);\n        for (i = 1; i < j; i++) {\n            if (((val[i] = BN_CTX_get(ctx)) == NULL) ||\n                !BN_mod_mul_reciprocal(val[i], val[i - 1], aa, &recp, ctx))\n                goto err;\n        }\n    }\n    start = 1;\n    wvalue = 0;\n    wstart = bits - 1;\n    wend = 0;\n    if (!BN_one(r))\n        goto err;\n    for (;;) {\n        if (BN_is_bit_set(p, wstart) == 0) {\n            if (!start)\n                if (!BN_mod_mul_reciprocal(r, r, r, &recp, ctx))\n                    goto err;\n            if (wstart == 0)\n                break;\n            wstart--;\n            continue;\n        }\n        j = wstart;\n        wvalue = 1;\n        wend = 0;\n        for (i = 1; i < window; i++) {\n            if (wstart - i < 0)\n                break;\n            if (BN_is_bit_set(p, wstart - i)) {\n                wvalue <<= (i - wend);\n                wvalue |= 1;\n                wend = i;\n            }\n        }\n        j = wend + 1;\n        if (!start)\n            for (i = 0; i < j; i++) {\n                if (!BN_mod_mul_reciprocal(r, r, r, &recp, ctx))\n                    goto err;\n            }\n        if (!BN_mod_mul_reciprocal(r, r, val[wvalue >> 1], &recp, ctx))\n            goto err;\n        wstart -= wend + 1;\n        wvalue = 0;\n        start = 0;\n        if (wstart < 0)\n            break;\n    }\n    ret = 1;\n err:\n    BN_CTX_end(ctx);\n    BN_RECP_CTX_free(&recp);\n    bn_check_top(r);\n    return (ret);\n}', 'int BN_RECP_CTX_set(BN_RECP_CTX *recp, const BIGNUM *d, BN_CTX *ctx)\n{\n    if (!BN_copy(&(recp->N), d))\n        return 0;\n    BN_zero(&(recp->Nr));\n    recp->num_bits = BN_num_bits(d);\n    recp->shift = 0;\n    return (1);\n}', 'BIGNUM *bn_wexpand(BIGNUM *a, int words)\n{\n    return (words <= a->dmax) ? a : bn_expand2(a, words);\n}']