crypto/ec/ecp_smpl.c:1004: error: BUFFER_OVERRUN_L3
  Offset added: [8, +oo] Size: [0, 536870848] by call to `BN_mod_lshift1_quick`.
Showing all 18 steps of the trace


crypto/ec/ecp_smpl.c:973:10: Call
971.   
972.       BN_CTX_start(ctx);
973.       rh = BN_CTX_get(ctx);
                ^
974.       tmp = BN_CTX_get(ctx);
975.       Z4 = 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: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/ec/ecp_smpl.c:1004:18: Call
1002.           /* rh := (rh + a*Z^4)*X */
1003.           if (group->a_is_minus3) {
1004.               if (!BN_mod_lshift1_quick(tmp, Z4, p))
                         ^
1005.                   goto err;
1006.               if (!BN_mod_add_quick(tmp, tmp, Z4, p))

crypto/bn/bn_mod.c:122:1: Parameter `*r->d`
  120.    * m
  121.    */
  122. > int BN_mod_lshift1_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *m)
  123.   {
  124.       if (!BN_lshift1(r, a))

crypto/bn/bn_mod.c:124:10: Call
  122.   int BN_mod_lshift1_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *m)
  123.   {
  124.       if (!BN_lshift1(r, a))
                  ^
  125.           return 0;
  126.       bn_check_top(r);

crypto/bn/bn_shift.c:13:1: Parameter `*r->d`
    11.   #include "bn_lcl.h"
    12.   
    13. > int BN_lshift1(BIGNUM *r, const BIGNUM *a)
    14.   {
    15.       register BN_ULONG *ap, *rp, t, c;

crypto/bn/bn_shift.c:23:13: Call
    21.       if (r != a) {
    22.           r->neg = a->neg;
    23.           if (bn_wexpand(r, a->top + 1) == NULL)
                      ^
    24.               return 0;
    25.           r->top = a->top;

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_mod_lshift1_quick` 
          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 ec_GFp_simple_is_on_curve(const EC_GROUP *group, const EC_POINT *point,\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 *rh, *tmp, *Z4, *Z6;\n    int ret = -1;\n    if (EC_POINT_is_at_infinity(group, point))\n        return 1;\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 -1;\n    }\n    BN_CTX_start(ctx);\n    rh = BN_CTX_get(ctx);\n    tmp = BN_CTX_get(ctx);\n    Z4 = BN_CTX_get(ctx);\n    Z6 = BN_CTX_get(ctx);\n    if (Z6 == NULL)\n        goto err;\n    if (!field_sqr(group, rh, point->X, ctx))\n        goto err;\n    if (!point->Z_is_one) {\n        if (!field_sqr(group, tmp, point->Z, ctx))\n            goto err;\n        if (!field_sqr(group, Z4, tmp, ctx))\n            goto err;\n        if (!field_mul(group, Z6, Z4, tmp, ctx))\n            goto err;\n        if (group->a_is_minus3) {\n            if (!BN_mod_lshift1_quick(tmp, Z4, p))\n                goto err;\n            if (!BN_mod_add_quick(tmp, tmp, Z4, p))\n                goto err;\n            if (!BN_mod_sub_quick(rh, rh, tmp, p))\n                goto err;\n            if (!field_mul(group, rh, rh, point->X, ctx))\n                goto err;\n        } else {\n            if (!field_mul(group, tmp, Z4, group->a, ctx))\n                goto err;\n            if (!BN_mod_add_quick(rh, rh, tmp, p))\n                goto err;\n            if (!field_mul(group, rh, rh, point->X, ctx))\n                goto err;\n        }\n        if (!field_mul(group, tmp, group->b, Z6, ctx))\n            goto err;\n        if (!BN_mod_add_quick(rh, rh, tmp, p))\n            goto err;\n    } else {\n        if (!BN_mod_add_quick(rh, rh, group->a, p))\n            goto err;\n        if (!field_mul(group, rh, rh, point->X, ctx))\n            goto err;\n        if (!BN_mod_add_quick(rh, rh, group->b, p))\n            goto err;\n    }\n    if (!field_sqr(group, tmp, point->Y, ctx))\n        goto err;\n    ret = (0 == BN_ucmp(tmp, rh));\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_lshift1_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *m)\n{\n    if (!BN_lshift1(r, a))\n        return 0;\n    bn_check_top(r);\n    if (BN_cmp(r, m) >= 0)\n        return BN_sub(r, r, m);\n    return 1;\n}', 'int BN_lshift1(BIGNUM *r, const BIGNUM *a)\n{\n    register BN_ULONG *ap, *rp, t, c;\n    int i;\n    bn_check_top(r);\n    bn_check_top(a);\n    if (r != a) {\n        r->neg = a->neg;\n        if (bn_wexpand(r, a->top + 1) == NULL)\n            return 0;\n        r->top = a->top;\n    } else {\n        if (bn_wexpand(r, a->top + 1) == NULL)\n            return 0;\n    }\n    ap = a->d;\n    rp = r->d;\n    c = 0;\n    for (i = 0; i < a->top; i++) {\n        t = *(ap++);\n        *(rp++) = ((t << 1) | c) & BN_MASK2;\n        c = (t & BN_TBIT) ? 1 : 0;\n    }\n    if (c) {\n        *rp = 1;\n        r->top++;\n    }\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}']