crypto/ec/ecp_smpl.c:852: error: BUFFER_OVERRUN_L3
  Offset added: [8, +oo] Size: [0, 536870848] by call to `BN_mod_sub_quick`.
Showing all 20 steps of the trace


crypto/ec/ecp_smpl.c:823:10: Call
821.   
822.       BN_CTX_start(ctx);
823.       n0 = BN_CTX_get(ctx);
                ^
824.       n1 = BN_CTX_get(ctx);
825.       n2 = BN_CTX_get(ctx);

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

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

crypto/ec/ecp_smpl.c:852:14: Call
850.           if (!BN_mod_add_quick(n0, a->X, n1, p))
851.               goto err;
852.           if (!BN_mod_sub_quick(n2, a->X, n1, p))
                    ^
853.               goto err;
854.           if (!field_mul(group, n1, n0, n2, ctx))

crypto/bn/bn_mod.c:116:1: Parameter `*r->d`
  114.    * less than m
  115.    */
  116. > int BN_mod_sub_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
  117.                        const BIGNUM *m)
  118.   {

crypto/bn/bn_mod.c:119:10: Call
  117.                        const BIGNUM *m)
  118.   {
  119.       if (!BN_sub(r, a, b))
                  ^
  120.           return 0;
  121.       if (r->neg)

crypto/bn/bn_add.c:45:1: Parameter `*r->d`
    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->d`
      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: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:950:37: Call
        948.   BIGNUM *bn_wexpand(BIGNUM *a, int words)
        949.   {
        950.       return (words <= a->dmax) ? a : bn_expand2(a, words);
                                                   ^
        951.   }
        952.   

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_mod_sub_quick` 
            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;
}
['int ec_GFp_simple_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,\n                      BN_CTX *ctx)\n{\n    int (*field_mul) (const EC_GROUP *, BIGNUM *, const BIGNUM *,\n                      const BIGNUM *, BN_CTX *);\n    int (*field_sqr) (const EC_GROUP *, BIGNUM *, const BIGNUM *, BN_CTX *);\n    const BIGNUM *p;\n    BN_CTX *new_ctx = NULL;\n    BIGNUM *n0, *n1, *n2, *n3;\n    int ret = 0;\n    if (EC_POINT_is_at_infinity(group, a)) {\n        BN_zero(r->Z);\n        r->Z_is_one = 0;\n        return 1;\n    }\n    field_mul = group->meth->field_mul;\n    field_sqr = group->meth->field_sqr;\n    p = group->field;\n    if (ctx == NULL) {\n        ctx = new_ctx = BN_CTX_new();\n        if (ctx == NULL)\n            return 0;\n    }\n    BN_CTX_start(ctx);\n    n0 = BN_CTX_get(ctx);\n    n1 = BN_CTX_get(ctx);\n    n2 = BN_CTX_get(ctx);\n    n3 = BN_CTX_get(ctx);\n    if (n3 == NULL)\n        goto err;\n    if (a->Z_is_one) {\n        if (!field_sqr(group, n0, a->X, ctx))\n            goto err;\n        if (!BN_mod_lshift1_quick(n1, n0, p))\n            goto err;\n        if (!BN_mod_add_quick(n0, n0, n1, p))\n            goto err;\n        if (!BN_mod_add_quick(n1, n0, group->a, p))\n            goto err;\n    } else if (group->a_is_minus3) {\n        if (!field_sqr(group, n1, a->Z, ctx))\n            goto err;\n        if (!BN_mod_add_quick(n0, a->X, n1, p))\n            goto err;\n        if (!BN_mod_sub_quick(n2, a->X, n1, p))\n            goto err;\n        if (!field_mul(group, n1, n0, n2, ctx))\n            goto err;\n        if (!BN_mod_lshift1_quick(n0, n1, p))\n            goto err;\n        if (!BN_mod_add_quick(n1, n0, n1, p))\n            goto err;\n    } else {\n        if (!field_sqr(group, n0, a->X, ctx))\n            goto err;\n        if (!BN_mod_lshift1_quick(n1, n0, p))\n            goto err;\n        if (!BN_mod_add_quick(n0, n0, n1, p))\n            goto err;\n        if (!field_sqr(group, n1, a->Z, ctx))\n            goto err;\n        if (!field_sqr(group, n1, n1, ctx))\n            goto err;\n        if (!field_mul(group, n1, n1, group->a, ctx))\n            goto err;\n        if (!BN_mod_add_quick(n1, n1, n0, p))\n            goto err;\n    }\n    if (a->Z_is_one) {\n        if (!BN_copy(n0, a->Y))\n            goto err;\n    } else {\n        if (!field_mul(group, n0, a->Y, a->Z, ctx))\n            goto err;\n    }\n    if (!BN_mod_lshift1_quick(r->Z, n0, p))\n        goto err;\n    r->Z_is_one = 0;\n    if (!field_sqr(group, n3, a->Y, ctx))\n        goto err;\n    if (!field_mul(group, n2, a->X, n3, ctx))\n        goto err;\n    if (!BN_mod_lshift_quick(n2, n2, 2, p))\n        goto err;\n    if (!BN_mod_lshift1_quick(n0, n2, p))\n        goto err;\n    if (!field_sqr(group, r->X, n1, ctx))\n        goto err;\n    if (!BN_mod_sub_quick(r->X, r->X, n0, p))\n        goto err;\n    if (!field_sqr(group, n0, n3, ctx))\n        goto err;\n    if (!BN_mod_lshift_quick(n3, n0, 3, p))\n        goto err;\n    if (!BN_mod_sub_quick(n0, n2, r->X, p))\n        goto err;\n    if (!field_mul(group, n0, n1, n0, ctx))\n        goto err;\n    if (!BN_mod_sub_quick(r->Y, n0, n3, p))\n        goto err;\n    ret = 1;\n err:\n    BN_CTX_end(ctx);\n    BN_CTX_free(new_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_mod_sub_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,\n                     const BIGNUM *m)\n{\n    if (!BN_sub(r, a, b))\n        return 0;\n    if (r->neg)\n        return BN_add(r, r, m);\n    return 1;\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    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}']