crypto/bn/bn_rand.c:161: error: BUFFER_OVERRUN_L3
  Offset added: [8, +oo] Size: [0, 67108856] by call to `BN_sub`.
Showing all 25 steps of the trace


crypto/bn/bn_rand.c:150:18: Call
148.            */
149.           do {
150.               if (!bnrand(flag, r, n + 1, BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY,
                        ^
151.                           ctx))
152.                   return 0;

crypto/bn/bn_rand.c:23:1: Parameter `rnd->top`
  21.   } BNRAND_FLAG;
  22.   
  23. > static int bnrand(BNRAND_FLAG flag, BIGNUM *rnd, int bits, int top, int bottom,
  24.                     BN_CTX *ctx)
  25.   {

crypto/bn/bn_rand.c:160:17: Call
158.                * .75.
159.                */
160.               if (BN_cmp(r, range) >= 0) {
                       ^
161.                   if (!BN_sub(r, r, range))
162.                       return 0;

crypto/bn/bn_lib.c:581:1: Parameter `a->top`
  579.   }
  580.   
  581. > int BN_cmp(const BIGNUM *a, const BIGNUM *b)
  582.   {
  583.       int i;

crypto/bn/bn_rand.c:161:22: Call
159.                */
160.               if (BN_cmp(r, range) >= 0) {
161.                   if (!BN_sub(r, r, range))
                            ^
162.                       return 0;
163.                   if (BN_cmp(r, range) >= 0)

crypto/bn/bn_add.c:45:1: Parameter `r->top`
  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->top`
    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:962:1: Parameter `a->top`
      960.   }
      961.   
      962. > BIGNUM *bn_wexpand(BIGNUM *a, int words)
      963.   {
      964.       return (words <= a->dmax) ? a : bn_expand2(a, words);

crypto/bn/bn_lib.c:964:37: Call
      962.   BIGNUM *bn_wexpand(BIGNUM *a, int words)
      963.   {
      964.       return (words <= a->dmax) ? a : bn_expand2(a, words);
                                                 ^
      965.   }
      966.   

crypto/bn/bn_lib.c:245:1: Parameter `b->top`
        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 `words`
          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:224:13: Call
          222.           a = OPENSSL_secure_zalloc(words * sizeof(*a));
          223.       else
          224.           a = OPENSSL_zalloc(words * sizeof(*a));
                             ^
          225.       if (a == NULL) {
          226.           BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);

crypto/mem.c:228:1: Parameter `num`
            226.   }
            227.   
            228. > void *CRYPTO_zalloc(size_t num, const char *file, int line)
            229.   {
            230.       void *ret = CRYPTO_malloc(num, file, line);

crypto/mem.c:230:17: Call
            228.   void *CRYPTO_zalloc(size_t num, const char *file, int line)
            229.   {
            230.       void *ret = CRYPTO_malloc(num, file, line);
                                   ^
            231.   
            232.       FAILTEST();

crypto/mem.c:201:9: Assignment
              199.   
              200.       if (num == 0)
              201.           return NULL;
                             ^
              202.   
              203.       FAILTEST();

crypto/mem.c:230:5: Assignment
            228.   void *CRYPTO_zalloc(size_t num, const char *file, int line)
            229.   {
            230.       void *ret = CRYPTO_malloc(num, file, line);
                       ^
            231.   
            232.       FAILTEST();

crypto/mem.c:235:5: Assignment
            233.       if (ret != NULL)
            234.           memset(ret, 0, num);
            235.       return ret;
                       ^
            236.   }
            237.   

crypto/bn/bn_lib.c:224:9: Assignment
          222.           a = OPENSSL_secure_zalloc(words * sizeof(*a));
          223.       else
          224.           a = OPENSSL_zalloc(words * sizeof(*a));
                         ^
          225.       if (a == NULL) {
          226.           BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);

crypto/bn/bn_lib.c:232:9: Array access: Offset added: [8, +oo] Size: [0, 67108856] by call to `BN_sub` 
          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;
}
['static int bnrand_range(BNRAND_FLAG flag, BIGNUM *r, const BIGNUM *range,\n                        BN_CTX *ctx)\n{\n    int n;\n    int count = 100;\n    if (range->neg || BN_is_zero(range)) {\n        BNerr(BN_F_BNRAND_RANGE, BN_R_INVALID_RANGE);\n        return 0;\n    }\n    n = BN_num_bits(range);\n    if (n == 1)\n        BN_zero(r);\n    else if (!BN_is_bit_set(range, n - 2) && !BN_is_bit_set(range, n - 3)) {\n        do {\n            if (!bnrand(flag, r, n + 1, BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY,\n                        ctx))\n                return 0;\n            if (BN_cmp(r, range) >= 0) {\n                if (!BN_sub(r, r, range))\n                    return 0;\n                if (BN_cmp(r, range) >= 0)\n                    if (!BN_sub(r, r, range))\n                        return 0;\n            }\n            if (!--count) {\n                BNerr(BN_F_BNRAND_RANGE, BN_R_TOO_MANY_ITERATIONS);\n                return 0;\n            }\n        }\n        while (BN_cmp(r, range) >= 0);\n    } else {\n        do {\n            if (!bnrand(flag, r, n, BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY, ctx))\n                return 0;\n            if (!--count) {\n                BNerr(BN_F_BNRAND_RANGE, BN_R_TOO_MANY_ITERATIONS);\n                return 0;\n            }\n        }\n        while (BN_cmp(r, range) >= 0);\n    }\n    bn_check_top(r);\n    return 1;\n}', 'static int bnrand(BNRAND_FLAG flag, BIGNUM *rnd, int bits, int top, int bottom,\n                  BN_CTX *ctx)\n{\n    unsigned char *buf = NULL;\n    int b, ret = 0, bit, bytes, mask;\n    OPENSSL_CTX *libctx = bn_get_lib_ctx(ctx);\n    if (bits == 0) {\n        if (top != BN_RAND_TOP_ANY || bottom != BN_RAND_BOTTOM_ANY)\n            goto toosmall;\n        BN_zero(rnd);\n        return 1;\n    }\n    if (bits < 0 || (bits == 1 && top > 0))\n        goto toosmall;\n    bytes = (bits + 7) / 8;\n    bit = (bits - 1) % 8;\n    mask = 0xff << (bit + 1);\n    buf = OPENSSL_malloc(bytes);\n    if (buf == NULL) {\n        BNerr(BN_F_BNRAND, ERR_R_MALLOC_FAILURE);\n        goto err;\n    }\n    b = flag == NORMAL ? rand_bytes_ex(libctx, buf, bytes)\n                       : rand_priv_bytes_ex(libctx, buf, bytes);\n    if (b <= 0)\n        goto err;\n    if (flag == TESTING) {\n        int i;\n        unsigned char c;\n        for (i = 0; i < bytes; i++) {\n            if (rand_bytes_ex(libctx, &c, 1) <= 0)\n                goto err;\n            if (c >= 128 && i > 0)\n                buf[i] = buf[i - 1];\n            else if (c < 42)\n                buf[i] = 0;\n            else if (c < 84)\n                buf[i] = 255;\n        }\n    }\n    if (top >= 0) {\n        if (top) {\n            if (bit == 0) {\n                buf[0] = 1;\n                buf[1] |= 0x80;\n            } else {\n                buf[0] |= (3 << (bit - 1));\n            }\n        } else {\n            buf[0] |= (1 << bit);\n        }\n    }\n    buf[0] &= ~mask;\n    if (bottom)\n        buf[bytes - 1] |= 1;\n    if (!BN_bin2bn(buf, bytes, rnd))\n        goto err;\n    ret = 1;\n err:\n    OPENSSL_clear_free(buf, bytes);\n    bn_check_top(rnd);\n    return ret;\ntoosmall:\n    BNerr(BN_F_BNRAND, BN_R_BITS_TOO_SMALL);\n    return 0;\n}', 'int BN_cmp(const BIGNUM *a, const BIGNUM *b)\n{\n    int i;\n    int gt, lt;\n    BN_ULONG t1, t2;\n    if ((a == NULL) || (b == NULL)) {\n        if (a != NULL)\n            return -1;\n        else if (b != NULL)\n            return 1;\n        else\n            return 0;\n    }\n    bn_check_top(a);\n    bn_check_top(b);\n    if (a->neg != b->neg) {\n        if (a->neg)\n            return -1;\n        else\n            return 1;\n    }\n    if (a->neg == 0) {\n        gt = 1;\n        lt = -1;\n    } else {\n        gt = -1;\n        lt = 1;\n    }\n    if (a->top > b->top)\n        return gt;\n    if (a->top < b->top)\n        return lt;\n    for (i = a->top - 1; i >= 0; i--) {\n        t1 = a->d[i];\n        t2 = b->d[i];\n        if (t1 > t2)\n            return gt;\n        if (t1 < t2)\n            return lt;\n    }\n    return 0;\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}', 'void *CRYPTO_zalloc(size_t num, const char *file, int line)\n{\n    void *ret = CRYPTO_malloc(num, file, line);\n    FAILTEST();\n    if (ret != NULL)\n        memset(ret, 0, num);\n    return ret;\n}', 'void *CRYPTO_malloc(size_t num, const char *file, int line)\n{\n    void *ret = NULL;\n    INCREMENT(malloc_count);\n    if (malloc_impl != NULL && malloc_impl != CRYPTO_malloc)\n        return malloc_impl(num, file, line);\n    if (num == 0)\n        return NULL;\n    FAILTEST();\n    if (allow_customize) {\n        allow_customize = 0;\n    }\n#if !defined(OPENSSL_NO_CRYPTO_MDEBUG) && !defined(FIPS_MODE)\n    if (call_malloc_debug) {\n        CRYPTO_mem_debug_malloc(NULL, num, 0, file, line);\n        ret = malloc(num);\n        CRYPTO_mem_debug_malloc(ret, num, 1, file, line);\n    } else {\n        ret = malloc(num);\n    }\n#else\n    (void)(file); (void)(line);\n    ret = malloc(num);\n#endif\n    return ret;\n}']