crypto/bn/bn_exp2.c:72: error: BUFFER_OVERRUN_L3
  Offset: [-1, +oo] Size: [1, +oo] by call to `BN_div`.
Showing all 14 steps of the trace


crypto/bn/bn_exp2.c:16:1: Parameter `ctx->stack.depth`
14.   #define TABLE_SIZE      32
15.   
16. > int BN_mod_exp2_mont(BIGNUM *rr, const BIGNUM *a1, const BIGNUM *p1,
17.                        const BIGNUM *a2, const BIGNUM *p2, const BIGNUM *m,
18.                        BN_CTX *ctx, BN_MONT_CTX *in_mont)

crypto/bn/bn_exp2.c:48:5: Call
46.       bits = (bits1 > bits2) ? bits1 : bits2;
47.   
48.       BN_CTX_start(ctx);
          ^
49.       d = BN_CTX_get(ctx);
50.       r = BN_CTX_get(ctx);

crypto/bn/bn_ctx.c:181:1: Parameter `ctx->stack.depth`
  179.   }
  180.   
  181. > void BN_CTX_start(BN_CTX *ctx)
  182.   {
  183.       CTXDBG_ENTRY("BN_CTX_start", ctx);

crypto/bn/bn_exp2.c:72:14: Call
70.        */
71.       if (a1->neg || BN_ucmp(a1, m) >= 0) {
72.           if (!BN_mod(val1[0], a1, m, ctx))
                   ^
73.               goto err;
74.           a_mod_m = val1[0];

crypto/bn/bn_div.c:193:5: Call
  191.       }
  192.   
  193.       BN_CTX_start(ctx);
             ^
  194.       res = (dv == NULL) ? BN_CTX_get(ctx) : dv;
  195.       tmp = BN_CTX_get(ctx);

crypto/bn/bn_ctx.c:181:1: Parameter `*ctx->stack.indexes`
    179.   }
    180.   
    181. > void BN_CTX_start(BN_CTX *ctx)
    182.   {
    183.       CTXDBG_ENTRY("BN_CTX_start", ctx);

crypto/bn/bn_div.c:413:5: Call
  411.       if (no_branch)
  412.           bn_correct_top(res);
  413.       BN_CTX_end(ctx);
             ^
  414.       return 1;
  415.    err:

crypto/bn/bn_ctx.c:195:1: Parameter `*ctx->stack.indexes`
    193.   }
    194.   
    195. > void BN_CTX_end(BN_CTX *ctx)
    196.   {
    197.       CTXDBG_ENTRY("BN_CTX_end", ctx);

crypto/bn/bn_ctx.c:201:27: Call
    199.           ctx->err_stack--;
    200.       else {
    201.           unsigned int fp = BN_STACK_pop(&ctx->stack);
                                     ^
    202.           /* Does this stack frame have anything to release? */
    203.           if (fp < ctx->used)

crypto/bn/bn_ctx.c:271:1: <Offset trace>
269.   }
270.   
271. > static unsigned int BN_STACK_pop(BN_STACK *st)
272.   {
273.       return st->indexes[--(st->depth)];

crypto/bn/bn_ctx.c:271:1: Parameter `st->depth`
      269.   }
      270.   
      271. > static unsigned int BN_STACK_pop(BN_STACK *st)
      272.   {
      273.       return st->indexes[--(st->depth)];

crypto/bn/bn_ctx.c:271:1: <Length trace>
269.   }
270.   
271. > static unsigned int BN_STACK_pop(BN_STACK *st)
272.   {
273.       return st->indexes[--(st->depth)];

crypto/bn/bn_ctx.c:271:1: Parameter `*st->indexes`
      269.   }
      270.   
      271. > static unsigned int BN_STACK_pop(BN_STACK *st)
      272.   {
      273.       return st->indexes[--(st->depth)];

crypto/bn/bn_ctx.c:273:12: Array access: Offset: [-1, +oo] Size: [1, +oo] by call to `BN_div` 
      271.   static unsigned int BN_STACK_pop(BN_STACK *st)
      272.   {
      273.       return st->indexes[--(st->depth)];
                        ^
      274.   }
      275.   

static unsigned int BN_STACK_pop(BN_STACK *st)
{
    return st->indexes[--(st->depth)];
}
['int BN_mod_exp2_mont(BIGNUM *rr, const BIGNUM *a1, const BIGNUM *p1,\n                     const BIGNUM *a2, const BIGNUM *p2, const BIGNUM *m,\n                     BN_CTX *ctx, BN_MONT_CTX *in_mont)\n{\n    int i, j, bits, b, bits1, bits2, ret =\n        0, wpos1, wpos2, window1, window2, wvalue1, wvalue2;\n    int r_is_one = 1;\n    BIGNUM *d, *r;\n    const BIGNUM *a_mod_m;\n    BIGNUM *val1[TABLE_SIZE], *val2[TABLE_SIZE];\n    BN_MONT_CTX *mont = NULL;\n    bn_check_top(a1);\n    bn_check_top(p1);\n    bn_check_top(a2);\n    bn_check_top(p2);\n    bn_check_top(m);\n    if (!(m->d[0] & 1)) {\n        BNerr(BN_F_BN_MOD_EXP2_MONT, BN_R_CALLED_WITH_EVEN_MODULUS);\n        return (0);\n    }\n    bits1 = BN_num_bits(p1);\n    bits2 = BN_num_bits(p2);\n    if ((bits1 == 0) && (bits2 == 0)) {\n        ret = BN_one(rr);\n        return ret;\n    }\n    bits = (bits1 > bits2) ? bits1 : bits2;\n    BN_CTX_start(ctx);\n    d = BN_CTX_get(ctx);\n    r = BN_CTX_get(ctx);\n    val1[0] = BN_CTX_get(ctx);\n    val2[0] = BN_CTX_get(ctx);\n    if (val2[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    window1 = BN_window_bits_for_exponent_size(bits1);\n    window2 = BN_window_bits_for_exponent_size(bits2);\n    if (a1->neg || BN_ucmp(a1, m) >= 0) {\n        if (!BN_mod(val1[0], a1, m, ctx))\n            goto err;\n        a_mod_m = val1[0];\n    } else\n        a_mod_m = a1;\n    if (BN_is_zero(a_mod_m)) {\n        BN_zero(rr);\n        ret = 1;\n        goto err;\n    }\n    if (!BN_to_montgomery(val1[0], a_mod_m, mont, ctx))\n        goto err;\n    if (window1 > 1) {\n        if (!BN_mod_mul_montgomery(d, val1[0], val1[0], mont, ctx))\n            goto err;\n        j = 1 << (window1 - 1);\n        for (i = 1; i < j; i++) {\n            if (((val1[i] = BN_CTX_get(ctx)) == NULL) ||\n                !BN_mod_mul_montgomery(val1[i], val1[i - 1], d, mont, ctx))\n                goto err;\n        }\n    }\n    if (a2->neg || BN_ucmp(a2, m) >= 0) {\n        if (!BN_mod(val2[0], a2, m, ctx))\n            goto err;\n        a_mod_m = val2[0];\n    } else\n        a_mod_m = a2;\n    if (BN_is_zero(a_mod_m)) {\n        BN_zero(rr);\n        ret = 1;\n        goto err;\n    }\n    if (!BN_to_montgomery(val2[0], a_mod_m, mont, ctx))\n        goto err;\n    if (window2 > 1) {\n        if (!BN_mod_mul_montgomery(d, val2[0], val2[0], mont, ctx))\n            goto err;\n        j = 1 << (window2 - 1);\n        for (i = 1; i < j; i++) {\n            if (((val2[i] = BN_CTX_get(ctx)) == NULL) ||\n                !BN_mod_mul_montgomery(val2[i], val2[i - 1], d, mont, ctx))\n                goto err;\n        }\n    }\n    r_is_one = 1;\n    wvalue1 = 0;\n    wvalue2 = 0;\n    wpos1 = 0;\n    wpos2 = 0;\n    if (!BN_to_montgomery(r, BN_value_one(), mont, ctx))\n        goto err;\n    for (b = bits - 1; b >= 0; b--) {\n        if (!r_is_one) {\n            if (!BN_mod_mul_montgomery(r, r, r, mont, ctx))\n                goto err;\n        }\n        if (!wvalue1)\n            if (BN_is_bit_set(p1, b)) {\n                i = b - window1 + 1;\n                while (!BN_is_bit_set(p1, i))\n                    i++;\n                wpos1 = i;\n                wvalue1 = 1;\n                for (i = b - 1; i >= wpos1; i--) {\n                    wvalue1 <<= 1;\n                    if (BN_is_bit_set(p1, i))\n                        wvalue1++;\n                }\n            }\n        if (!wvalue2)\n            if (BN_is_bit_set(p2, b)) {\n                i = b - window2 + 1;\n                while (!BN_is_bit_set(p2, i))\n                    i++;\n                wpos2 = i;\n                wvalue2 = 1;\n                for (i = b - 1; i >= wpos2; i--) {\n                    wvalue2 <<= 1;\n                    if (BN_is_bit_set(p2, i))\n                        wvalue2++;\n                }\n            }\n        if (wvalue1 && b == wpos1) {\n            if (!BN_mod_mul_montgomery(r, r, val1[wvalue1 >> 1], mont, ctx))\n                goto err;\n            wvalue1 = 0;\n            r_is_one = 0;\n        }\n        if (wvalue2 && b == wpos2) {\n            if (!BN_mod_mul_montgomery(r, r, val2[wvalue2 >> 1], mont, ctx))\n                goto err;\n            wvalue2 = 0;\n            r_is_one = 0;\n        }\n    }\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}', 'void BN_CTX_start(BN_CTX *ctx)\n{\n    CTXDBG_ENTRY("BN_CTX_start", ctx);\n    if (ctx->err_stack || ctx->too_many)\n        ctx->err_stack++;\n    else if (!BN_STACK_push(&ctx->stack, ctx->used)) {\n        BNerr(BN_F_BN_CTX_START, BN_R_TOO_MANY_TEMPORARY_VARIABLES);\n        ctx->err_stack++;\n    }\n    CTXDBG_EXIT(ctx);\n}', 'int BN_div(BIGNUM *dv, BIGNUM *rm, const BIGNUM *num, const BIGNUM *divisor,\n           BN_CTX *ctx)\n{\n    int norm_shift, i, loop;\n    BIGNUM *tmp, wnum, *snum, *sdiv, *res;\n    BN_ULONG *resp, *wnump;\n    BN_ULONG d0, d1;\n    int num_n, div_n;\n    int no_branch = 0;\n    if ((num->top > 0 && num->d[num->top - 1] == 0) ||\n        (divisor->top > 0 && divisor->d[divisor->top - 1] == 0)) {\n        BNerr(BN_F_BN_DIV, BN_R_NOT_INITIALIZED);\n        return 0;\n    }\n    bn_check_top(num);\n    bn_check_top(divisor);\n    if ((BN_get_flags(num, BN_FLG_CONSTTIME) != 0)\n        || (BN_get_flags(divisor, BN_FLG_CONSTTIME) != 0)) {\n        no_branch = 1;\n    }\n    bn_check_top(dv);\n    bn_check_top(rm);\n    if (BN_is_zero(divisor)) {\n        BNerr(BN_F_BN_DIV, BN_R_DIV_BY_ZERO);\n        return (0);\n    }\n    if (!no_branch && BN_ucmp(num, divisor) < 0) {\n        if (rm != NULL) {\n            if (BN_copy(rm, num) == NULL)\n                return (0);\n        }\n        if (dv != NULL)\n            BN_zero(dv);\n        return 1;\n    }\n    BN_CTX_start(ctx);\n    res = (dv == NULL) ? BN_CTX_get(ctx) : dv;\n    tmp = BN_CTX_get(ctx);\n    snum = BN_CTX_get(ctx);\n    sdiv = BN_CTX_get(ctx);\n    if (sdiv == NULL)\n        goto err;\n    norm_shift = BN_BITS2 - ((BN_num_bits(divisor)) % BN_BITS2);\n    if (!(BN_lshift(sdiv, divisor, norm_shift)))\n        goto err;\n    sdiv->neg = 0;\n    norm_shift += BN_BITS2;\n    if (!(BN_lshift(snum, num, norm_shift)))\n        goto err;\n    snum->neg = 0;\n    if (no_branch) {\n        if (snum->top <= sdiv->top + 1) {\n            if (bn_wexpand(snum, sdiv->top + 2) == NULL)\n                goto err;\n            for (i = snum->top; i < sdiv->top + 2; i++)\n                snum->d[i] = 0;\n            snum->top = sdiv->top + 2;\n        } else {\n            if (bn_wexpand(snum, snum->top + 1) == NULL)\n                goto err;\n            snum->d[snum->top] = 0;\n            snum->top++;\n        }\n    }\n    div_n = sdiv->top;\n    num_n = snum->top;\n    loop = num_n - div_n;\n    wnum.neg = 0;\n    wnum.d = &(snum->d[loop]);\n    wnum.top = div_n;\n    wnum.dmax = snum->dmax - loop;\n    d0 = sdiv->d[div_n - 1];\n    d1 = (div_n == 1) ? 0 : sdiv->d[div_n - 2];\n    wnump = &(snum->d[num_n - 1]);\n    if (!bn_wexpand(res, (loop + 1)))\n        goto err;\n    res->neg = (num->neg ^ divisor->neg);\n    res->top = loop - no_branch;\n    resp = &(res->d[loop - 1]);\n    if (!bn_wexpand(tmp, (div_n + 1)))\n        goto err;\n    if (!no_branch) {\n        if (BN_ucmp(&wnum, sdiv) >= 0) {\n            bn_clear_top2max(&wnum);\n            bn_sub_words(wnum.d, wnum.d, sdiv->d, div_n);\n            *resp = 1;\n        } else\n            res->top--;\n    }\n    resp++;\n    if (res->top == 0)\n        res->neg = 0;\n    else\n        resp--;\n    for (i = 0; i < loop - 1; i++, wnump--) {\n        BN_ULONG q, l0;\n# if defined(BN_DIV3W) && !defined(OPENSSL_NO_ASM)\n        BN_ULONG bn_div_3_words(BN_ULONG *, BN_ULONG, BN_ULONG);\n        q = bn_div_3_words(wnump, d1, d0);\n# else\n        BN_ULONG n0, n1, rem = 0;\n        n0 = wnump[0];\n        n1 = wnump[-1];\n        if (n0 == d0)\n            q = BN_MASK2;\n        else {\n#  ifdef BN_LLONG\n            BN_ULLONG t2;\n#   if defined(BN_LLONG) && defined(BN_DIV2W) && !defined(bn_div_words)\n            q = (BN_ULONG)(((((BN_ULLONG) n0) << BN_BITS2) | n1) / d0);\n#   else\n            q = bn_div_words(n0, n1, d0);\n#   endif\n#   ifndef REMAINDER_IS_ALREADY_CALCULATED\n            rem = (n1 - q * d0) & BN_MASK2;\n#   endif\n            t2 = (BN_ULLONG) d1 *q;\n            for (;;) {\n                if (t2 <= ((((BN_ULLONG) rem) << BN_BITS2) | wnump[-2]))\n                    break;\n                q--;\n                rem += d0;\n                if (rem < d0)\n                    break;\n                t2 -= d1;\n            }\n#  else\n            BN_ULONG t2l, t2h;\n            q = bn_div_words(n0, n1, d0);\n#   ifndef REMAINDER_IS_ALREADY_CALCULATED\n            rem = (n1 - q * d0) & BN_MASK2;\n#   endif\n#   if defined(BN_UMULT_LOHI)\n            BN_UMULT_LOHI(t2l, t2h, d1, q);\n#   elif defined(BN_UMULT_HIGH)\n            t2l = d1 * q;\n            t2h = BN_UMULT_HIGH(d1, q);\n#   else\n            {\n                BN_ULONG ql, qh;\n                t2l = LBITS(d1);\n                t2h = HBITS(d1);\n                ql = LBITS(q);\n                qh = HBITS(q);\n                mul64(t2l, t2h, ql, qh);\n            }\n#   endif\n            for (;;) {\n                if ((t2h < rem) || ((t2h == rem) && (t2l <= wnump[-2])))\n                    break;\n                q--;\n                rem += d0;\n                if (rem < d0)\n                    break;\n                if (t2l < d1)\n                    t2h--;\n                t2l -= d1;\n            }\n#  endif\n        }\n# endif\n        l0 = bn_mul_words(tmp->d, sdiv->d, div_n, q);\n        tmp->d[div_n] = l0;\n        wnum.d--;\n        if (bn_sub_words(wnum.d, wnum.d, tmp->d, div_n + 1)) {\n            q--;\n            if (bn_add_words(wnum.d, wnum.d, sdiv->d, div_n))\n                (*wnump)++;\n        }\n        resp--;\n        *resp = q;\n    }\n    bn_correct_top(snum);\n    if (rm != NULL) {\n        int neg = num->neg;\n        BN_rshift(rm, snum, norm_shift);\n        if (!BN_is_zero(rm))\n            rm->neg = neg;\n        bn_check_top(rm);\n    }\n    if (no_branch)\n        bn_correct_top(res);\n    BN_CTX_end(ctx);\n    return 1;\n err:\n    bn_check_top(rm);\n    BN_CTX_end(ctx);\n    return (0);\n}', 'void BN_CTX_end(BN_CTX *ctx)\n{\n    CTXDBG_ENTRY("BN_CTX_end", ctx);\n    if (ctx->err_stack)\n        ctx->err_stack--;\n    else {\n        unsigned int fp = BN_STACK_pop(&ctx->stack);\n        if (fp < ctx->used)\n            BN_POOL_release(&ctx->pool, ctx->used - fp);\n        ctx->used = fp;\n        ctx->too_many = 0;\n    }\n    CTXDBG_EXIT(ctx);\n}', 'static unsigned int BN_STACK_pop(BN_STACK *st)\n{\n    return st->indexes[--(st->depth)];\n}']