crypto/dsa/dsa_ossl.c:208: error: BUFFER_OVERRUN_L3
  Offset added: [8, +oo] Size: [0, 536870848] by call to `bn_wexpand`.
Showing all 12 steps of the trace


crypto/dsa/dsa_ossl.c:207:10: Call
205.       q_bits = BN_num_bits(dsa->q);
206.       q_words = bn_get_top(dsa->q);
207.       if (!bn_wexpand(k, q_words + 2)
                ^
208.           || !bn_wexpand(l, q_words + 2))
209.           goto err;

crypto/bn/bn_lib.c:962:1: Parameter `*a->d`
  960.   }
  961.   
  962. > BIGNUM *bn_wexpand(BIGNUM *a, int words)
  963.   {
  964.       return (words <= a->dmax) ? a : bn_expand2(a, words);

crypto/dsa/dsa_ossl.c:208:13: Call
206.       q_words = bn_get_top(dsa->q);
207.       if (!bn_wexpand(k, q_words + 2)
208.           || !bn_wexpand(l, q_words + 2))
                   ^
209.           goto err;
210.   

crypto/bn/bn_lib.c:962:1: Parameter `*a->d`
  960.   }
  961.   
  962. > BIGNUM *bn_wexpand(BIGNUM *a, int words)
  963.   {
  964.       return (words <= a->dmax) ? a : bn_expand2(a, words);

crypto/bn/bn_lib.c:964:37: Call
  962.   BIGNUM *bn_wexpand(BIGNUM *a, int words)
  963.   {
  964.       return (words <= a->dmax) ? a : bn_expand2(a, words);
                                             ^
  965.   }
  966.   

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

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

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

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

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

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

crypto/bn/bn_lib.c:232:9: Array access: Offset added: [8, +oo] Size: [0, 536870848] by call to `bn_wexpand` 
      230.       assert(b->top <= words);
      231.       if (b->top > 0)
      232.           memcpy(a, b->d, sizeof(*a) * b->top);
                     ^
      233.   
      234.       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 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;\n    int ret = 0;\n    int q_bits, q_words;\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    if (k == NULL || l == 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    q_words = bn_get_top(dsa->q);\n    if (!bn_wexpand(k, q_words + 2)\n        || !bn_wexpand(l, q_words + 2))\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(k, l, dsa->q))\n        goto err;\n    BN_consttime_swap(BN_is_bit_set(l, q_bits), k, l, q_words + 2);\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 = dsa_mod_inverse_fermat(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    return ret;\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}']