crypto/ec/ec2_mult.c:271: error: BUFFER_OVERRUN_L3
  Offset: [3, +oo] (⇐ [0, +oo] + 3) Size: [0, 8388607] by call to `BN_GF2m_add`.
Showing all 13 steps of the trace


crypto/ec/ec2_mult.c:259:12: Call
257.       if (bn_wexpand(x1, group_top) == NULL
258.           || bn_wexpand(z1, group_top) == NULL
259.           || bn_wexpand(x2, group_top) == NULL
                  ^
260.           || bn_wexpand(z2, group_top) == NULL)
261.           goto err;

crypto/bn/bn_lib.c:1016:1: Parameter `*a->d`
  1014.   }
  1015.   
  1016. > BIGNUM *bn_wexpand(BIGNUM *a, int words)
  1017.   {
  1018.       return (words <= a->dmax) ? a : bn_expand2(a, words);

crypto/ec/ec2_mult.c:271:10: Call
269.       if (!group->meth->field_sqr(group, x2, z2, ctx))
270.           goto err;
271.       if (!BN_GF2m_add(x2, x2, group->b))
                ^
272.           goto err;               /* x2 = x^4 + b */
273.   

crypto/bn/bn_gf2m.c:260:1: Parameter `*r->d`
  258.    * could be equal; r is the bitwise XOR of a and b.
  259.    */
  260. > int BN_GF2m_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
  261.   {
  262.       int i;

crypto/bn/bn_gf2m.c:276:9: Call
  274.       }
  275.   
  276.       if (bn_wexpand(r, at->top) == NULL)
                 ^
  277.           return 0;
  278.   

crypto/bn/bn_lib.c:1016:1: Parameter `*a->d`
    1014.   }
    1015.   
    1016. > BIGNUM *bn_wexpand(BIGNUM *a, int words)
    1017.   {
    1018.       return (words <= a->dmax) ? a : bn_expand2(a, words);

crypto/bn/bn_lib.c:1018:37: Call
    1016.   BIGNUM *bn_wexpand(BIGNUM *a, int words)
    1017.   {
    1018.       return (words <= a->dmax) ? a : bn_expand2(a, words);
                                                ^
    1019.   }
    1020.   

crypto/bn/bn_lib.c:323:1: Parameter `*b->d`
      321.    */
      322.   
      323. > BIGNUM *bn_expand2(BIGNUM *b, int words)
      324.   {
      325.       bn_check_top(b);

crypto/bn/bn_lib.c:328:23: Call
      326.   
      327.       if (words > b->dmax) {
      328.           BN_ULONG *a = bn_expand_internal(b, words);
                                   ^
      329.           if (!a)
      330.               return NULL;

crypto/bn/bn_lib.c:246:1: <Length trace>
244.   /* This is used by bn_expand2() */
245.   /* The caller MUST check that words > b->dmax before calling this */
246. > static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
247.   {
248.       BN_ULONG *A, *a = NULL;

crypto/bn/bn_lib.c:246:1: Parameter `*b->d`
        244.   /* This is used by bn_expand2() */
        245.   /* The caller MUST check that words > b->dmax before calling this */
        246. > static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
        247.   {
        248.       BN_ULONG *A, *a = NULL;

crypto/bn/bn_lib.c:272:5: Assignment
        270.   
        271.   #if 1
        272.       B = b->d;
                   ^
        273.       /* Check if the previous number needs to be copied */
        274.       if (B != NULL) {

crypto/bn/bn_lib.c:289:18: Array access: Offset: [3, +oo] (⇐ [0, +oo] + 3) Size: [0, 8388607] by call to `BN_GF2m_add` 
        287.               a1 = B[1];
        288.               a2 = B[2];
        289.               a3 = B[3];
                                ^
        290.               A[0] = a0;
        291.               A[1] = a1;

static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
{
    BN_ULONG *A, *a = NULL;
    const BN_ULONG *B;
    int i;
    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 = A = OPENSSL_secure_zalloc(words * sizeof(*a));
    else
        a = A = OPENSSL_zalloc(words * sizeof(*a));
    if (A == NULL) {
        BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);
        return (NULL);
    }
#if 1
    B = b->d;
    if (B != NULL) {
        for (i = b->top >> 2; i > 0; i--, A += 4, B += 4) {
            BN_ULONG a0, a1, a2, a3;
            a0 = B[0];
            a1 = B[1];
            a2 = B[2];
            a3 = B[3];
            A[0] = a0;
            A[1] = a1;
            A[2] = a2;
            A[3] = a3;
        }
        switch (b->top & 3) {
        case 3:
            A[2] = B[2];
        case 2:
            A[1] = B[1];
        case 1:
            A[0] = B[0];
        case 0:
            ;
        }
    }
#else
    memset(A, 0, sizeof(*A) * words);
    memcpy(A, b->d, sizeof(b->d[0]) * b->top);
#endif
    return (a);
}
['static int ec_GF2m_montgomery_point_multiply(const EC_GROUP *group,\n                                             EC_POINT *r,\n                                             const BIGNUM *scalar,\n                                             const EC_POINT *point,\n                                             BN_CTX *ctx)\n{\n    BIGNUM *x1, *x2, *z1, *z2;\n    int ret = 0, i, group_top;\n    BN_ULONG mask, word;\n    if (r == point) {\n        ECerr(EC_F_EC_GF2M_MONTGOMERY_POINT_MULTIPLY, EC_R_INVALID_ARGUMENT);\n        return 0;\n    }\n    if ((scalar == NULL) || BN_is_zero(scalar) || (point == NULL) ||\n        EC_POINT_is_at_infinity(group, point)) {\n        return EC_POINT_set_to_infinity(group, r);\n    }\n    if (!point->Z_is_one)\n        return 0;\n    BN_CTX_start(ctx);\n    x1 = BN_CTX_get(ctx);\n    z1 = BN_CTX_get(ctx);\n    if (z1 == NULL)\n        goto err;\n    x2 = r->X;\n    z2 = r->Y;\n    group_top = bn_get_top(group->field);\n    if (bn_wexpand(x1, group_top) == NULL\n        || bn_wexpand(z1, group_top) == NULL\n        || bn_wexpand(x2, group_top) == NULL\n        || bn_wexpand(z2, group_top) == NULL)\n        goto err;\n    if (!BN_GF2m_mod_arr(x1, point->X, group->poly))\n        goto err;\n    if (!BN_one(z1))\n        goto err;\n    if (!group->meth->field_sqr(group, z2, x1, ctx))\n        goto err;\n    if (!group->meth->field_sqr(group, x2, z2, ctx))\n        goto err;\n    if (!BN_GF2m_add(x2, x2, group->b))\n        goto err;\n    i = bn_get_top(scalar) - 1;\n    mask = BN_TBIT;\n    word = bn_get_words(scalar)[i];\n    while (!(word & mask))\n        mask >>= 1;\n    mask >>= 1;\n    if (!mask) {\n        i--;\n        mask = BN_TBIT;\n    }\n    for (; i >= 0; i--) {\n        word = bn_get_words(scalar)[i];\n        while (mask) {\n            BN_consttime_swap(word & mask, x1, x2, group_top);\n            BN_consttime_swap(word & mask, z1, z2, group_top);\n            if (!gf2m_Madd(group, point->X, x2, z2, x1, z1, ctx))\n                goto err;\n            if (!gf2m_Mdouble(group, x1, z1, ctx))\n                goto err;\n            BN_consttime_swap(word & mask, x1, x2, group_top);\n            BN_consttime_swap(word & mask, z1, z2, group_top);\n            mask >>= 1;\n        }\n        mask = BN_TBIT;\n    }\n    i = gf2m_Mxy(group, point->X, point->Y, x1, z1, x2, z2, ctx);\n    if (i == 0)\n        goto err;\n    else if (i == 1) {\n        if (!EC_POINT_set_to_infinity(group, r))\n            goto err;\n    } else {\n        if (!BN_one(r->Z))\n            goto err;\n        r->Z_is_one = 1;\n    }\n    BN_set_negative(r->X, 0);\n    BN_set_negative(r->Y, 0);\n    ret = 1;\n err:\n    BN_CTX_end(ctx);\n    return ret;\n}', 'BIGNUM *bn_wexpand(BIGNUM *a, int words)\n{\n    return (words <= a->dmax) ? a : bn_expand2(a, words);\n}', 'int BN_GF2m_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)\n{\n    int i;\n    const BIGNUM *at, *bt;\n    bn_check_top(a);\n    bn_check_top(b);\n    if (a->top < b->top) {\n        at = b;\n        bt = a;\n    } else {\n        at = a;\n        bt = b;\n    }\n    if (bn_wexpand(r, at->top) == NULL)\n        return 0;\n    for (i = 0; i < bt->top; i++) {\n        r->d[i] = at->d[i] ^ bt->d[i];\n    }\n    for (; i < at->top; i++) {\n        r->d[i] = at->d[i];\n    }\n    r->top = at->top;\n    bn_correct_top(r);\n    return 1;\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, *a = NULL;\n    const BN_ULONG *B;\n    int i;\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 = A = OPENSSL_secure_zalloc(words * sizeof(*a));\n    else\n        a = 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#if 1\n    B = b->d;\n    if (B != NULL) {\n        for (i = b->top >> 2; i > 0; i--, A += 4, B += 4) {\n            BN_ULONG a0, a1, a2, a3;\n            a0 = B[0];\n            a1 = B[1];\n            a2 = B[2];\n            a3 = B[3];\n            A[0] = a0;\n            A[1] = a1;\n            A[2] = a2;\n            A[3] = a3;\n        }\n        switch (b->top & 3) {\n        case 3:\n            A[2] = B[2];\n        case 2:\n            A[1] = B[1];\n        case 1:\n            A[0] = B[0];\n        case 0:\n            ;\n        }\n    }\n#else\n    memset(A, 0, sizeof(*A) * words);\n    memcpy(A, b->d, sizeof(b->d[0]) * b->top);\n#endif\n    return (a);\n}']