crypto/bn/bn_sqr.c:39: error: BUFFER_OVERRUN_L3
  Offset added: [8, +oo] Size: [0, 67108856] by call to `bn_wexpand`.
Showing all 18 steps of the trace


crypto/bn/bn_sqr.c:17:1: Parameter `r->top`
15.    * I've just gone over this and it is now %20 faster on x86 - eay - 27 Jun 96
16.    */
17. > int BN_sqr(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
18.   {
19.       int max, al;

crypto/bn/bn_sqr.c:39:9: Call
37.   
38.       max = 2 * al;               /* Non-zero (from above) */
39.       if (bn_wexpand(rr, max) == NULL)
              ^
40.           goto err;
41.   

crypto/bn/bn_lib.c:942:1: Parameter `a->top`
  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->top`
    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 `words`
      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:223:13: Call
      221.           a = OPENSSL_secure_zalloc(words * sizeof(*a));
      222.       else
      223.           a = OPENSSL_zalloc(words * sizeof(*a));
                         ^
      224.       if (a == NULL) {
      225.           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:223:9: Assignment
      221.           a = OPENSSL_secure_zalloc(words * sizeof(*a));
      222.       else
      223.           a = OPENSSL_zalloc(words * sizeof(*a));
                     ^
      224.       if (a == NULL) {
      225.           BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);

crypto/bn/bn_lib.c:231:9: Array access: Offset added: [8, +oo] Size: [0, 67108856] by call to `bn_wexpand` 
      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 BN_sqr(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)\n{\n    int max, al;\n    int ret = 0;\n    BIGNUM *tmp, *rr;\n    bn_check_top(a);\n    al = a->top;\n    if (al <= 0) {\n        r->top = 0;\n        r->neg = 0;\n        return 1;\n    }\n    BN_CTX_start(ctx);\n    rr = (a != r) ? r : BN_CTX_get(ctx);\n    tmp = BN_CTX_get(ctx);\n    if (rr == NULL || tmp == NULL)\n        goto err;\n    max = 2 * al;\n    if (bn_wexpand(rr, max) == NULL)\n        goto err;\n    if (al == 4) {\n#ifndef BN_SQR_COMBA\n        BN_ULONG t[8];\n        bn_sqr_normal(rr->d, a->d, 4, t);\n#else\n        bn_sqr_comba4(rr->d, a->d);\n#endif\n    } else if (al == 8) {\n#ifndef BN_SQR_COMBA\n        BN_ULONG t[16];\n        bn_sqr_normal(rr->d, a->d, 8, t);\n#else\n        bn_sqr_comba8(rr->d, a->d);\n#endif\n    } else {\n#if defined(BN_RECURSION)\n        if (al < BN_SQR_RECURSIVE_SIZE_NORMAL) {\n            BN_ULONG t[BN_SQR_RECURSIVE_SIZE_NORMAL * 2];\n            bn_sqr_normal(rr->d, a->d, al, t);\n        } else {\n            int j, k;\n            j = BN_num_bits_word((BN_ULONG)al);\n            j = 1 << (j - 1);\n            k = j + j;\n            if (al == j) {\n                if (bn_wexpand(tmp, k * 2) == NULL)\n                    goto err;\n                bn_sqr_recursive(rr->d, a->d, al, tmp->d);\n            } else {\n                if (bn_wexpand(tmp, max) == NULL)\n                    goto err;\n                bn_sqr_normal(rr->d, a->d, al, tmp->d);\n            }\n        }\n#else\n        if (bn_wexpand(tmp, max) == NULL)\n            goto err;\n        bn_sqr_normal(rr->d, a->d, al, tmp->d);\n#endif\n    }\n    rr->neg = 0;\n    rr->top = max;\n    bn_correct_top(rr);\n    if (r != rr && BN_copy(r, rr) == NULL)\n        goto err;\n    ret = 1;\n err:\n    bn_check_top(rr);\n    bn_check_top(tmp);\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}', '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#ifndef OPENSSL_NO_CRYPTO_MDEBUG\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}']