crypto/bn/bn_gf2m.c:805: error: BUFFER_OVERRUN_L3
  Offset added: [8, +oo] Size: [0, 536870848] by call to `BN_GF2m_mod_inv`.
Showing all 22 steps of the trace


crypto/bn/bn_gf2m.c:801:12: Call
799.   
800.       BN_CTX_start(ctx);
801.       xinv = BN_CTX_get(ctx);
                  ^
802.       if (xinv == NULL)
803.           goto err;

crypto/bn/bn_ctx.c:229:5: Call
  227.       }
  228.       /* OK, make sure the returned bignum is "zero" */
  229.       BN_zero(ret);
             ^
  230.       ctx->used++;
  231.       CTXDBG_RET(ctx, ret);

crypto/bn/bn_lib.c:365:15: Assignment
    363.       a->neg = 0;
    364.       a->d[0] = w;
    365.       a->top = (w ? 1 : 0);
                         ^
    366.       a->flags &= ~BN_FLG_FIXED_TOP;
    367.       bn_check_top(a);

crypto/bn/bn_lib.c:365:5: Assignment
    363.       a->neg = 0;
    364.       a->d[0] = w;
    365.       a->top = (w ? 1 : 0);
               ^
    366.       a->flags &= ~BN_FLG_FIXED_TOP;
    367.       bn_check_top(a);

crypto/bn/bn_gf2m.c:805:10: Call
803.           goto err;
804.   
805.       if (!BN_GF2m_mod_inv(xinv, x, p, ctx))
                ^
806.           goto err;
807.       if (!BN_GF2m_mod_mul(r, y, xinv, p, ctx))

crypto/bn/bn_gf2m.c:724:1: Parameter `*r->d`
  722.    * But it does eliminate first order deduction on the input.
  723.    */
  724. > int BN_GF2m_mod_inv(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
  725.   {
  726.       BIGNUM *b = NULL;

crypto/bn/bn_gf2m.c:741:10: Call
  739.   
  740.       /* r := a * b */
  741.       if (!BN_GF2m_mod_mul(r, a, b, p, ctx))
                  ^
  742.           goto err;
  743.   

crypto/bn/bn_gf2m.c:465:1: Parameter `*r->d`
    463.    * BN_GF2m_mod_mul_arr function.
    464.    */
    465. > int BN_GF2m_mod_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
    466.                       const BIGNUM *p, BN_CTX *ctx)
    467.   {

crypto/bn/bn_gf2m.c:481:11: Call
    479.           goto err;
    480.       }
    481.       ret = BN_GF2m_mod_mul_arr(r, a, b, arr, ctx);
                     ^
    482.       bn_check_top(r);
    483.    err:

crypto/bn/bn_gf2m.c:410:1: Parameter `*r->d`
      408.    * the result in r.  r could be a or b; a could be b.
      409.    */
      410. > int BN_GF2m_mod_mul_arr(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
      411.                           const int p[], BN_CTX *ctx)
      412.   {

crypto/bn/bn_gf2m.c:449:9: Call
      447.   
      448.       bn_correct_top(s);
      449.       if (BN_GF2m_mod_arr(r, s, p))
                     ^
      450.           ret = 1;
      451.       bn_check_top(r);

crypto/bn/bn_gf2m.c:292:1: Parameter `*r->d`
        290.   
        291.   /* Performs modular reduction of a and store result in r.  r could be a. */
        292. > int BN_GF2m_mod_arr(BIGNUM *r, const BIGNUM *a, const int p[])
        293.   {
        294.       int j, k;

crypto/bn/bn_gf2m.c:311:14: Call
        309.        */
        310.       if (a != r) {
        311.           if (!bn_wexpand(r, a->top))
                            ^
        312.               return 0;
        313.           for (j = 0; j < a->top; j++) {

crypto/bn/bn_lib.c:942:1: Parameter `*a->d`
          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->d`
            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 `*b->d`
              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:231:9: Array access: Offset added: [8, +oo] Size: [0, 536870848] by call to `BN_GF2m_mod_inv` 
              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;
}
['int BN_GF2m_mod_div(BIGNUM *r, const BIGNUM *y, const BIGNUM *x,\n                    const BIGNUM *p, BN_CTX *ctx)\n{\n    BIGNUM *xinv = NULL;\n    int ret = 0;\n    bn_check_top(y);\n    bn_check_top(x);\n    bn_check_top(p);\n    BN_CTX_start(ctx);\n    xinv = BN_CTX_get(ctx);\n    if (xinv == NULL)\n        goto err;\n    if (!BN_GF2m_mod_inv(xinv, x, p, ctx))\n        goto err;\n    if (!BN_GF2m_mod_mul(r, y, xinv, p, ctx))\n        goto err;\n    bn_check_top(r);\n    ret = 1;\n err:\n    BN_CTX_end(ctx);\n    return ret;\n}', 'BIGNUM *BN_CTX_get(BN_CTX *ctx)\n{\n    BIGNUM *ret;\n    CTXDBG_ENTRY("BN_CTX_get", ctx);\n    if (ctx->err_stack || ctx->too_many)\n        return NULL;\n    if ((ret = BN_POOL_get(&ctx->pool, ctx->flags)) == NULL) {\n        ctx->too_many = 1;\n        BNerr(BN_F_BN_CTX_GET, BN_R_TOO_MANY_TEMPORARY_VARIABLES);\n        return NULL;\n    }\n    BN_zero(ret);\n    ctx->used++;\n    CTXDBG_RET(ctx, ret);\n    return ret;\n}', 'int BN_set_word(BIGNUM *a, BN_ULONG w)\n{\n    bn_check_top(a);\n    if (bn_expand(a, (int)sizeof(BN_ULONG) * 8) == NULL)\n        return 0;\n    a->neg = 0;\n    a->d[0] = w;\n    a->top = (w ? 1 : 0);\n    a->flags &= ~BN_FLG_FIXED_TOP;\n    bn_check_top(a);\n    return 1;\n}', 'int BN_GF2m_mod_inv(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)\n{\n    BIGNUM *b = NULL;\n    int ret = 0;\n    BN_CTX_start(ctx);\n    if ((b = BN_CTX_get(ctx)) == NULL)\n        goto err;\n    do {\n        if (!BN_priv_rand(b, BN_num_bits(p) - 1,\n                          BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY))\n            goto err;\n    } while (BN_is_zero(b));\n    if (!BN_GF2m_mod_mul(r, a, b, p, ctx))\n        goto err;\n    if (!BN_GF2m_mod_inv_vartime(r, r, p, ctx))\n        goto err;\n    if (!BN_GF2m_mod_mul(r, r, b, p, ctx))\n        goto err;\n    ret = 1;\n err:\n    BN_CTX_end(ctx);\n    return ret;\n}', 'int BN_GF2m_mod_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,\n                    const BIGNUM *p, BN_CTX *ctx)\n{\n    int ret = 0;\n    const int max = BN_num_bits(p) + 1;\n    int *arr = NULL;\n    bn_check_top(a);\n    bn_check_top(b);\n    bn_check_top(p);\n    if ((arr = OPENSSL_malloc(sizeof(*arr) * max)) == NULL)\n        goto err;\n    ret = BN_GF2m_poly2arr(p, arr, max);\n    if (!ret || ret > max) {\n        BNerr(BN_F_BN_GF2M_MOD_MUL, BN_R_INVALID_LENGTH);\n        goto err;\n    }\n    ret = BN_GF2m_mod_mul_arr(r, a, b, arr, ctx);\n    bn_check_top(r);\n err:\n    OPENSSL_free(arr);\n    return ret;\n}', 'int BN_GF2m_mod_mul_arr(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,\n                        const int p[], BN_CTX *ctx)\n{\n    int zlen, i, j, k, ret = 0;\n    BIGNUM *s;\n    BN_ULONG x1, x0, y1, y0, zz[4];\n    bn_check_top(a);\n    bn_check_top(b);\n    if (a == b) {\n        return BN_GF2m_mod_sqr_arr(r, a, p, ctx);\n    }\n    BN_CTX_start(ctx);\n    if ((s = BN_CTX_get(ctx)) == NULL)\n        goto err;\n    zlen = a->top + b->top + 4;\n    if (!bn_wexpand(s, zlen))\n        goto err;\n    s->top = zlen;\n    for (i = 0; i < zlen; i++)\n        s->d[i] = 0;\n    for (j = 0; j < b->top; j += 2) {\n        y0 = b->d[j];\n        y1 = ((j + 1) == b->top) ? 0 : b->d[j + 1];\n        for (i = 0; i < a->top; i += 2) {\n            x0 = a->d[i];\n            x1 = ((i + 1) == a->top) ? 0 : a->d[i + 1];\n            bn_GF2m_mul_2x2(zz, x1, x0, y1, y0);\n            for (k = 0; k < 4; k++)\n                s->d[i + j + k] ^= zz[k];\n        }\n    }\n    bn_correct_top(s);\n    if (BN_GF2m_mod_arr(r, s, p))\n        ret = 1;\n    bn_check_top(r);\n err:\n    BN_CTX_end(ctx);\n    return ret;\n}', 'int BN_GF2m_mod_arr(BIGNUM *r, const BIGNUM *a, const int p[])\n{\n    int j, k;\n    int n, dN, d0, d1;\n    BN_ULONG zz, *z;\n    bn_check_top(a);\n    if (!p[0]) {\n        BN_zero(r);\n        return 1;\n    }\n    if (a != r) {\n        if (!bn_wexpand(r, a->top))\n            return 0;\n        for (j = 0; j < a->top; j++) {\n            r->d[j] = a->d[j];\n        }\n        r->top = a->top;\n    }\n    z = r->d;\n    dN = p[0] / BN_BITS2;\n    for (j = r->top - 1; j > dN;) {\n        zz = z[j];\n        if (z[j] == 0) {\n            j--;\n            continue;\n        }\n        z[j] = 0;\n        for (k = 1; p[k] != 0; k++) {\n            n = p[0] - p[k];\n            d0 = n % BN_BITS2;\n            d1 = BN_BITS2 - d0;\n            n /= BN_BITS2;\n            z[j - n] ^= (zz >> d0);\n            if (d0)\n                z[j - n - 1] ^= (zz << d1);\n        }\n        n = dN;\n        d0 = p[0] % BN_BITS2;\n        d1 = BN_BITS2 - d0;\n        z[j - n] ^= (zz >> d0);\n        if (d0)\n            z[j - n - 1] ^= (zz << d1);\n    }\n    while (j == dN) {\n        d0 = p[0] % BN_BITS2;\n        zz = z[dN] >> d0;\n        if (zz == 0)\n            break;\n        d1 = BN_BITS2 - d0;\n        if (d0)\n            z[dN] = (z[dN] << d1) >> d1;\n        else\n            z[dN] = 0;\n        z[0] ^= zz;\n        for (k = 1; p[k] != 0; k++) {\n            BN_ULONG tmp_ulong;\n            n = p[k] / BN_BITS2;\n            d0 = p[k] % BN_BITS2;\n            d1 = BN_BITS2 - d0;\n            z[n] ^= (zz << d0);\n            if (d0 && (tmp_ulong = zz >> d1))\n                z[n + 1] ^= tmp_ulong;\n        }\n    }\n    bn_correct_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    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}']