crypto/pem/pvkfmt.c:284: error: BUFFER_OVERRUN_L3
  Offset: [1, +oo] Size: [0, 8388607] by call to `BN_mod_exp`.
Showing all 11 steps of the trace


crypto/pem/pvkfmt.c:261:10: Call
259.       if (dsa == NULL || ret == NULL)
260.           goto memerr;
261.       if (!read_lebn(&p, nbyte, &pbn))
                ^
262.           goto memerr;
263.   

crypto/pem/pvkfmt.c:47:10: Call
  45.   static int read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r)
  46.   {
  47.       *r = BN_lebin2bn(*in, nbyte, NULL);
                 ^
  48.       if (*r == NULL)
  49.           return 0;

crypto/bn/bn_lib.c:490:9: Assignment
    488.       n = len;
    489.       if (n == 0) {
    490.           ret->top = 0;
                   ^
    491.           return ret;
    492.       }

crypto/pem/pvkfmt.c:284:14: Call
282.               goto memerr;
283.   
284.           if (!BN_mod_exp(pub_key, gbn, priv_key, pbn, ctx))
                    ^
285.               goto memerr;
286.   

crypto/bn/bn_exp.c:89:1: Parameter `*m->d`
  87.   }
  88.   
  89. > int BN_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, const BIGNUM *m,
  90.                  BN_CTX *ctx)
  91.   {

crypto/bn/bn_exp.c:144:19: Call
  142.           } else
  143.   # endif
  144.               ret = BN_mod_exp_mont(r, a, p, m, ctx, NULL);
                           ^
  145.       } else
  146.   #endif

crypto/bn/bn_exp.c:388:14: <Offset trace>
386.           /* 2^(top*BN_BITS2) - m */
387.           r->d[0] = (0 - m->d[0]) & BN_MASK2;
388.           for (i = 1; i < j; i++)
                    ^
389.               r->d[i] = (~m->d[i]) & BN_MASK2;
390.           r->top = j;

crypto/bn/bn_exp.c:388:14: Assignment
    386.           /* 2^(top*BN_BITS2) - m */
    387.           r->d[0] = (0 - m->d[0]) & BN_MASK2;
    388.           for (i = 1; i < j; i++)
                        ^
    389.               r->d[i] = (~m->d[i]) & BN_MASK2;
    390.           r->top = j;

crypto/bn/bn_exp.c:296:1: <Length trace>
294.   }
295.   
296. > int BN_mod_exp_mont(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
297.                       const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont)
298.   {

crypto/bn/bn_exp.c:296:1: Parameter `*m->d`
    294.   }
    295.   
    296. > int BN_mod_exp_mont(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
    297.                       const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont)
    298.   {

crypto/bn/bn_exp.c:389:25: Array access: Offset: [1, +oo] Size: [0, 8388607] by call to `BN_mod_exp` 
    387.           r->d[0] = (0 - m->d[0]) & BN_MASK2;
    388.           for (i = 1; i < j; i++)
    389.               r->d[i] = (~m->d[i]) & BN_MASK2;
                                   ^
    390.           r->top = j;
    391.           r->flags |= BN_FLG_FIXED_TOP;

int BN_mod_exp_mont(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
                    const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont)
{
    int i, j, bits, ret = 0, wstart, wend, window, wvalue;
    int start = 1;
    BIGNUM *d, *r;
    const BIGNUM *aa;
    BIGNUM *val[TABLE_SIZE];
    BN_MONT_CTX *mont = NULL;
    if (BN_get_flags(p, BN_FLG_CONSTTIME) != 0
            || BN_get_flags(a, BN_FLG_CONSTTIME) != 0
            || BN_get_flags(m, BN_FLG_CONSTTIME) != 0) {
        return BN_mod_exp_mont_consttime(rr, a, p, m, ctx, in_mont);
    }
    bn_check_top(a);
    bn_check_top(p);
    bn_check_top(m);
    if (!BN_is_odd(m)) {
        BNerr(BN_F_BN_MOD_EXP_MONT, BN_R_CALLED_WITH_EVEN_MODULUS);
        return 0;
    }
    bits = BN_num_bits(p);
    if (bits == 0) {
        if (BN_abs_is_word(m, 1)) {
            ret = 1;
            BN_zero(rr);
        } else {
            ret = BN_one(rr);
        }
        return ret;
    }
    BN_CTX_start(ctx);
    d = BN_CTX_get(ctx);
    r = BN_CTX_get(ctx);
    val[0] = BN_CTX_get(ctx);
    if (val[0] == NULL)
        goto err;
    if (in_mont != NULL)
        mont = in_mont;
    else {
        if ((mont = BN_MONT_CTX_new()) == NULL)
            goto err;
        if (!BN_MONT_CTX_set(mont, m, ctx))
            goto err;
    }
    if (a->neg || BN_ucmp(a, m) >= 0) {
        if (!BN_nnmod(val[0], a, m, ctx))
            goto err;
        aa = val[0];
    } else
        aa = a;
    if (!bn_to_mont_fixed_top(val[0], aa, mont, ctx))
        goto err;
    window = BN_window_bits_for_exponent_size(bits);
    if (window > 1) {
        if (!bn_mul_mont_fixed_top(d, val[0], val[0], mont, ctx))
            goto err;
        j = 1 << (window - 1);
        for (i = 1; i < j; i++) {
            if (((val[i] = BN_CTX_get(ctx)) == NULL) ||
                !bn_mul_mont_fixed_top(val[i], val[i - 1], d, mont, ctx))
                goto err;
        }
    }
    start = 1;
    wvalue = 0;
    wstart = bits - 1;
    wend = 0;
#if 1
    j = m->top;
    if (m->d[j - 1] & (((BN_ULONG)1) << (BN_BITS2 - 1))) {
        if (bn_wexpand(r, j) == NULL)
            goto err;
        r->d[0] = (0 - m->d[0]) & BN_MASK2;
        for (i = 1; i < j; i++)
            r->d[i] = (~m->d[i]) & BN_MASK2;
        r->top = j;
        r->flags |= BN_FLG_FIXED_TOP;
    } else
#endif
    if (!bn_to_mont_fixed_top(r, BN_value_one(), mont, ctx))
        goto err;
    for (;;) {
        if (BN_is_bit_set(p, wstart) == 0) {
            if (!start) {
                if (!bn_mul_mont_fixed_top(r, r, r, mont, ctx))
                    goto err;
            }
            if (wstart == 0)
                break;
            wstart--;
            continue;
        }
        j = wstart;
        wvalue = 1;
        wend = 0;
        for (i = 1; i < window; i++) {
            if (wstart - i < 0)
                break;
            if (BN_is_bit_set(p, wstart - i)) {
                wvalue <<= (i - wend);
                wvalue |= 1;
                wend = i;
            }
        }
        j = wend + 1;
        if (!start)
            for (i = 0; i < j; i++) {
                if (!bn_mul_mont_fixed_top(r, r, r, mont, ctx))
                    goto err;
            }
        if (!bn_mul_mont_fixed_top(r, r, val[wvalue >> 1], mont, ctx))
            goto err;
        wstart -= wend + 1;
        wvalue = 0;
        start = 0;
        if (wstart < 0)
            break;
    }
#if defined(SPARC_T4_MONT)
    if (OPENSSL_sparcv9cap_P[0] & (SPARCV9_VIS3 | SPARCV9_PREFER_FPU)) {
        j = mont->N.top;
        val[0]->d[0] = 1;
        for (i = 1; i < j; i++)
            val[0]->d[i] = 0;
        val[0]->top = j;
        if (!BN_mod_mul_montgomery(rr, r, val[0], mont, ctx))
            goto err;
    } else
#endif
    if (!BN_from_montgomery(rr, r, mont, ctx))
        goto err;
    ret = 1;
 err:
    if (in_mont == NULL)
        BN_MONT_CTX_free(mont);
    BN_CTX_end(ctx);
    bn_check_top(rr);
    return ret;
}
['static EVP_PKEY *b2i_dss(const unsigned char **in,\n                         unsigned int bitlen, int ispub)\n{\n    const unsigned char *p = *in;\n    EVP_PKEY *ret = NULL;\n    DSA *dsa = NULL;\n    BN_CTX *ctx = NULL;\n    unsigned int nbyte;\n    BIGNUM *pbn = NULL, *qbn = NULL, *gbn = NULL, *priv_key = NULL;\n    BIGNUM *pub_key = NULL;\n    nbyte = (bitlen + 7) >> 3;\n    dsa = DSA_new();\n    ret = EVP_PKEY_new();\n    if (dsa == NULL || ret == NULL)\n        goto memerr;\n    if (!read_lebn(&p, nbyte, &pbn))\n        goto memerr;\n    if (!read_lebn(&p, 20, &qbn))\n        goto memerr;\n    if (!read_lebn(&p, nbyte, &gbn))\n        goto memerr;\n    if (ispub) {\n        if (!read_lebn(&p, nbyte, &pub_key))\n            goto memerr;\n    } else {\n        if (!read_lebn(&p, 20, &priv_key))\n            goto memerr;\n        pub_key = BN_new();\n        if (pub_key == NULL)\n            goto memerr;\n        if ((ctx = BN_CTX_new()) == NULL)\n            goto memerr;\n        if (!BN_mod_exp(pub_key, gbn, priv_key, pbn, ctx))\n            goto memerr;\n        BN_CTX_free(ctx);\n        ctx = NULL;\n    }\n    if (!DSA_set0_pqg(dsa, pbn, qbn, gbn))\n        goto memerr;\n    pbn = qbn = gbn = NULL;\n    if (!DSA_set0_key(dsa, pub_key, priv_key))\n        goto memerr;\n    pub_key = priv_key = NULL;\n    if (!EVP_PKEY_set1_DSA(ret, dsa))\n        goto memerr;\n    DSA_free(dsa);\n    *in = p;\n    return ret;\n memerr:\n    PEMerr(PEM_F_B2I_DSS, ERR_R_MALLOC_FAILURE);\n    DSA_free(dsa);\n    BN_free(pbn);\n    BN_free(qbn);\n    BN_free(gbn);\n    BN_free(pub_key);\n    BN_free(priv_key);\n    EVP_PKEY_free(ret);\n    BN_CTX_free(ctx);\n    return NULL;\n}', 'static int read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r)\n{\n    *r = BN_lebin2bn(*in, nbyte, NULL);\n    if (*r == NULL)\n        return 0;\n    *in += nbyte;\n    return 1;\n}', 'BIGNUM *BN_lebin2bn(const unsigned char *s, int len, BIGNUM *ret)\n{\n    unsigned int i, m;\n    unsigned int n;\n    BN_ULONG l;\n    BIGNUM *bn = NULL;\n    if (ret == NULL)\n        ret = bn = BN_new();\n    if (ret == NULL)\n        return NULL;\n    bn_check_top(ret);\n    s += len;\n    for ( ; len > 0 && s[-1] == 0; s--, len--)\n        continue;\n    n = len;\n    if (n == 0) {\n        ret->top = 0;\n        return ret;\n    }\n    i = ((n - 1) / BN_BYTES) + 1;\n    m = ((n - 1) % (BN_BYTES));\n    if (bn_wexpand(ret, (int)i) == NULL) {\n        BN_free(bn);\n        return NULL;\n    }\n    ret->top = i;\n    ret->neg = 0;\n    l = 0;\n    while (n--) {\n        s--;\n        l = (l << 8L) | *s;\n        if (m-- == 0) {\n            ret->d[--i] = l;\n            l = 0;\n            m = BN_BYTES - 1;\n        }\n    }\n    bn_correct_top(ret);\n    return ret;\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_get_flags(a, BN_FLG_CONSTTIME) == 0)\n            && (BN_get_flags(m, 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_mod_exp_mont(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,\n                    const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont)\n{\n    int i, j, bits, ret = 0, wstart, wend, window, wvalue;\n    int start = 1;\n    BIGNUM *d, *r;\n    const BIGNUM *aa;\n    BIGNUM *val[TABLE_SIZE];\n    BN_MONT_CTX *mont = NULL;\n    if (BN_get_flags(p, BN_FLG_CONSTTIME) != 0\n            || BN_get_flags(a, BN_FLG_CONSTTIME) != 0\n            || BN_get_flags(m, BN_FLG_CONSTTIME) != 0) {\n        return BN_mod_exp_mont_consttime(rr, a, p, m, ctx, in_mont);\n    }\n    bn_check_top(a);\n    bn_check_top(p);\n    bn_check_top(m);\n    if (!BN_is_odd(m)) {\n        BNerr(BN_F_BN_MOD_EXP_MONT, BN_R_CALLED_WITH_EVEN_MODULUS);\n        return 0;\n    }\n    bits = BN_num_bits(p);\n    if (bits == 0) {\n        if (BN_abs_is_word(m, 1)) {\n            ret = 1;\n            BN_zero(rr);\n        } else {\n            ret = BN_one(rr);\n        }\n        return ret;\n    }\n    BN_CTX_start(ctx);\n    d = BN_CTX_get(ctx);\n    r = BN_CTX_get(ctx);\n    val[0] = BN_CTX_get(ctx);\n    if (val[0] == NULL)\n        goto err;\n    if (in_mont != NULL)\n        mont = in_mont;\n    else {\n        if ((mont = BN_MONT_CTX_new()) == NULL)\n            goto err;\n        if (!BN_MONT_CTX_set(mont, m, ctx))\n            goto err;\n    }\n    if (a->neg || BN_ucmp(a, m) >= 0) {\n        if (!BN_nnmod(val[0], a, m, ctx))\n            goto err;\n        aa = val[0];\n    } else\n        aa = a;\n    if (!bn_to_mont_fixed_top(val[0], aa, mont, ctx))\n        goto err;\n    window = BN_window_bits_for_exponent_size(bits);\n    if (window > 1) {\n        if (!bn_mul_mont_fixed_top(d, val[0], val[0], mont, 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_mul_mont_fixed_top(val[i], val[i - 1], d, mont, ctx))\n                goto err;\n        }\n    }\n    start = 1;\n    wvalue = 0;\n    wstart = bits - 1;\n    wend = 0;\n#if 1\n    j = m->top;\n    if (m->d[j - 1] & (((BN_ULONG)1) << (BN_BITS2 - 1))) {\n        if (bn_wexpand(r, j) == NULL)\n            goto err;\n        r->d[0] = (0 - m->d[0]) & BN_MASK2;\n        for (i = 1; i < j; i++)\n            r->d[i] = (~m->d[i]) & BN_MASK2;\n        r->top = j;\n        r->flags |= BN_FLG_FIXED_TOP;\n    } else\n#endif\n    if (!bn_to_mont_fixed_top(r, BN_value_one(), mont, ctx))\n        goto err;\n    for (;;) {\n        if (BN_is_bit_set(p, wstart) == 0) {\n            if (!start) {\n                if (!bn_mul_mont_fixed_top(r, r, r, mont, ctx))\n                    goto err;\n            }\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_mul_mont_fixed_top(r, r, r, mont, ctx))\n                    goto err;\n            }\n        if (!bn_mul_mont_fixed_top(r, r, val[wvalue >> 1], mont, ctx))\n            goto err;\n        wstart -= wend + 1;\n        wvalue = 0;\n        start = 0;\n        if (wstart < 0)\n            break;\n    }\n#if defined(SPARC_T4_MONT)\n    if (OPENSSL_sparcv9cap_P[0] & (SPARCV9_VIS3 | SPARCV9_PREFER_FPU)) {\n        j = mont->N.top;\n        val[0]->d[0] = 1;\n        for (i = 1; i < j; i++)\n            val[0]->d[i] = 0;\n        val[0]->top = j;\n        if (!BN_mod_mul_montgomery(rr, r, val[0], mont, ctx))\n            goto err;\n    } else\n#endif\n    if (!BN_from_montgomery(rr, r, mont, ctx))\n        goto err;\n    ret = 1;\n err:\n    if (in_mont == NULL)\n        BN_MONT_CTX_free(mont);\n    BN_CTX_end(ctx);\n    bn_check_top(rr);\n    return ret;\n}']