test/bntest.c:763: error: INTEGER_OVERFLOW_L2
  ([0, +oo] - 1):unsigned32 by call to `BN_GF2m_mod_inv`.
Showing all 24 steps of the trace


test/bntest.c:763:13: Call
761.           BN_bntest_rand(a, 512, 0, 0);
762.           for (j = 0; j < 2; j++) {
763.               BN_GF2m_mod_inv(c, a, b[j], ctx);
                   ^
764.               BN_GF2m_mod_mul(d, a, c, b[j], ctx);
765.               /* Test that ((1/a)*a) = 1. */

crypto/bn/bn_gf2m.c:724:1: Parameter `ctx->stack.depth`
  722.    * But it does eliminate first order deduction on the input.
  723.    */
  724. > int BN_GF2m_mod_inv(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
  725.   {
  726.       BIGNUM *b = NULL;

crypto/bn/bn_gf2m.c:729:5: Call
  727.       int ret = 0;
  728.   
  729.       BN_CTX_start(ctx);
             ^
  730.       if ((b = BN_CTX_get(ctx)) == NULL)
  731.           goto err;

crypto/bn/bn_ctx.c:171:1: Parameter `ctx->stack.depth`
    169.   }
    170.   
    171. > void BN_CTX_start(BN_CTX *ctx)
    172.   {
    173.       CTXDBG("ENTER BN_CTX_start()", ctx);

crypto/bn/bn_gf2m.c:755:5: Call
  753.   
  754.    err:
  755.       BN_CTX_end(ctx);
             ^
  756.       return ret;
  757.   }

crypto/bn/bn_ctx.c:185:1: Parameter `ctx->stack.depth`
    183.   }
    184.   
    185. > void BN_CTX_end(BN_CTX *ctx)
    186.   {
    187.       CTXDBG("ENTER BN_CTX_end()", ctx);

test/bntest.c:764:13: Call
762.           for (j = 0; j < 2; j++) {
763.               BN_GF2m_mod_inv(c, a, b[j], ctx);
764.               BN_GF2m_mod_mul(d, a, c, b[j], ctx);
                   ^
765.               /* Test that ((1/a)*a) = 1. */
766.               if (!TEST_BN_eq_one(d))

crypto/bn/bn_gf2m.c:465:1: Parameter `ctx->stack.depth`
  463.    * BN_GF2m_mod_mul_arr function.
  464.    */
  465. > int BN_GF2m_mod_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
  466.                       const BIGNUM *p, BN_CTX *ctx)
  467.   {

test/bntest.c:763:13: Call
761.           BN_bntest_rand(a, 512, 0, 0);
762.           for (j = 0; j < 2; j++) {
763.               BN_GF2m_mod_inv(c, a, b[j], ctx);
                   ^
764.               BN_GF2m_mod_mul(d, a, c, b[j], ctx);
765.               /* Test that ((1/a)*a) = 1. */

crypto/bn/bn_gf2m.c:724:1: Parameter `ctx->stack.depth`
  722.    * But it does eliminate first order deduction on the input.
  723.    */
  724. > int BN_GF2m_mod_inv(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
  725.   {
  726.       BIGNUM *b = NULL;

crypto/bn/bn_gf2m.c:729:5: Call
  727.       int ret = 0;
  728.   
  729.       BN_CTX_start(ctx);
             ^
  730.       if ((b = BN_CTX_get(ctx)) == NULL)
  731.           goto err;

crypto/bn/bn_ctx.c:171:1: Parameter `ctx->stack.depth`
    169.   }
    170.   
    171. > void BN_CTX_start(BN_CTX *ctx)
    172.   {
    173.       CTXDBG("ENTER BN_CTX_start()", ctx);

crypto/bn/bn_gf2m.c:741:10: Call
  739.   
  740.       /* r := a * b */
  741.       if (!BN_GF2m_mod_mul(r, a, b, p, ctx))
                  ^
  742.           goto err;
  743.   

crypto/bn/bn_gf2m.c:465:1: Parameter `ctx->stack.depth`
    463.    * BN_GF2m_mod_mul_arr function.
    464.    */
    465. > int BN_GF2m_mod_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
    466.                       const BIGNUM *p, BN_CTX *ctx)
    467.   {

crypto/bn/bn_gf2m.c:481:11: Call
    479.           goto err;
    480.       }
    481.       ret = BN_GF2m_mod_mul_arr(r, a, b, arr, ctx);
                     ^
    482.       bn_check_top(r);
    483.    err:

crypto/bn/bn_gf2m.c:410:1: Parameter `ctx->stack.depth`
      408.    * the result in r.  r could be a or b; a could be b.
      409.    */
      410. > int BN_GF2m_mod_mul_arr(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
      411.                           const int p[], BN_CTX *ctx)
      412.   {

crypto/bn/bn_gf2m.c:424:5: Call
      422.       }
      423.   
      424.       BN_CTX_start(ctx);
                 ^
      425.       if ((s = BN_CTX_get(ctx)) == NULL)
      426.           goto err;

crypto/bn/bn_ctx.c:171:1: Parameter `ctx->stack.depth`
        169.   }
        170.   
        171. > void BN_CTX_start(BN_CTX *ctx)
        172.   {
        173.       CTXDBG("ENTER BN_CTX_start()", ctx);

crypto/bn/bn_gf2m.c:454:5: Call
      452.   
      453.    err:
      454.       BN_CTX_end(ctx);
                 ^
      455.       return ret;
      456.   }

crypto/bn/bn_ctx.c:185:1: Parameter `ctx->stack.depth`
        183.   }
        184.   
        185. > void BN_CTX_end(BN_CTX *ctx)
        186.   {
        187.       CTXDBG("ENTER BN_CTX_end()", ctx);

crypto/bn/bn_ctx.c:191:27: Call
        189.           ctx->err_stack--;
        190.       else {
        191.           unsigned int fp = BN_STACK_pop(&ctx->stack);
                                         ^
        192.           /* Does this stack frame have anything to release? */
        193.           if (fp < ctx->used)

crypto/bn/bn_ctx.c:266:1: <LHS trace>
264.   }
265.   
266. > static unsigned int BN_STACK_pop(BN_STACK *st)
267.   {
268.       return st->indexes[--(st->depth)];

crypto/bn/bn_ctx.c:266:1: Parameter `st->depth`
          264.   }
          265.   
          266. > static unsigned int BN_STACK_pop(BN_STACK *st)
          267.   {
          268.       return st->indexes[--(st->depth)];

crypto/bn/bn_ctx.c:268:12: Binary operation: ([0, +oo] - 1):unsigned32 by call to `BN_GF2m_mod_inv` 
          266.   static unsigned int BN_STACK_pop(BN_STACK *st)
          267.   {
          268.       return st->indexes[--(st->depth)];
                            ^
          269.   }
          270.   

static unsigned int BN_STACK_pop(BN_STACK *st)
{
    return st->indexes[--(st->depth)];
}
['static int test_gf2m_modinv(void)\n{\n    BIGNUM *a = NULL, *b[2] = {NULL,NULL}, *c = NULL, *d = NULL;\n    int i, j, st = 0;\n    if (!TEST_ptr(a = BN_new())\n            || !TEST_ptr(b[0] = BN_new())\n            || !TEST_ptr(b[1] = BN_new())\n            || !TEST_ptr(c = BN_new())\n            || !TEST_ptr(d = BN_new()))\n        goto err;\n    BN_GF2m_arr2poly(p0, b[0]);\n    BN_GF2m_arr2poly(p1, b[1]);\n    for (i = 0; i < NUM0; i++) {\n        BN_bntest_rand(a, 512, 0, 0);\n        for (j = 0; j < 2; j++) {\n            BN_GF2m_mod_inv(c, a, b[j], ctx);\n            BN_GF2m_mod_mul(d, a, c, b[j], ctx);\n            if (!TEST_BN_eq_one(d))\n                goto err;\n        }\n    }\n    st = 1;\n err:\n    BN_free(a);\n    BN_free(b[0]);\n    BN_free(b[1]);\n    BN_free(c);\n    BN_free(d);\n    return st;\n}', 'int BN_GF2m_mod_inv(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)\n{\n    BIGNUM *b = NULL;\n    int ret = 0;\n    BN_CTX_start(ctx);\n    if ((b = BN_CTX_get(ctx)) == NULL)\n        goto err;\n    do {\n        if (!BN_priv_rand(b, BN_num_bits(p) - 1,\n                          BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY))\n            goto err;\n    } while (BN_is_zero(b));\n    if (!BN_GF2m_mod_mul(r, a, b, p, ctx))\n        goto err;\n    if (!BN_GF2m_mod_inv_vartime(r, r, p, ctx))\n        goto err;\n    if (!BN_GF2m_mod_mul(r, r, b, p, ctx))\n        goto err;\n    ret = 1;\n err:\n    BN_CTX_end(ctx);\n    return ret;\n}', 'void BN_CTX_start(BN_CTX *ctx)\n{\n    CTXDBG("ENTER 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("LEAVE BN_CTX_start()", ctx);\n}', 'void BN_CTX_end(BN_CTX *ctx)\n{\n    CTXDBG("ENTER 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("LEAVE BN_CTX_end()", ctx);\n}', 'int BN_GF2m_mod_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,\n                    const BIGNUM *p, BN_CTX *ctx)\n{\n    int ret = 0;\n    const int max = BN_num_bits(p) + 1;\n    int *arr = NULL;\n    bn_check_top(a);\n    bn_check_top(b);\n    bn_check_top(p);\n    if ((arr = OPENSSL_malloc(sizeof(*arr) * max)) == NULL)\n        goto err;\n    ret = BN_GF2m_poly2arr(p, arr, max);\n    if (!ret || ret > max) {\n        BNerr(BN_F_BN_GF2M_MOD_MUL, BN_R_INVALID_LENGTH);\n        goto err;\n    }\n    ret = BN_GF2m_mod_mul_arr(r, a, b, arr, ctx);\n    bn_check_top(r);\n err:\n    OPENSSL_free(arr);\n    return ret;\n}', 'int BN_GF2m_mod_mul_arr(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,\n                        const int p[], BN_CTX *ctx)\n{\n    int zlen, i, j, k, ret = 0;\n    BIGNUM *s;\n    BN_ULONG x1, x0, y1, y0, zz[4];\n    bn_check_top(a);\n    bn_check_top(b);\n    if (a == b) {\n        return BN_GF2m_mod_sqr_arr(r, a, p, ctx);\n    }\n    BN_CTX_start(ctx);\n    if ((s = BN_CTX_get(ctx)) == NULL)\n        goto err;\n    zlen = a->top + b->top + 4;\n    if (!bn_wexpand(s, zlen))\n        goto err;\n    s->top = zlen;\n    for (i = 0; i < zlen; i++)\n        s->d[i] = 0;\n    for (j = 0; j < b->top; j += 2) {\n        y0 = b->d[j];\n        y1 = ((j + 1) == b->top) ? 0 : b->d[j + 1];\n        for (i = 0; i < a->top; i += 2) {\n            x0 = a->d[i];\n            x1 = ((i + 1) == a->top) ? 0 : a->d[i + 1];\n            bn_GF2m_mul_2x2(zz, x1, x0, y1, y0);\n            for (k = 0; k < 4; k++)\n                s->d[i + j + k] ^= zz[k];\n        }\n    }\n    bn_correct_top(s);\n    if (BN_GF2m_mod_arr(r, s, p))\n        ret = 1;\n    bn_check_top(r);\n err:\n    BN_CTX_end(ctx);\n    return ret;\n}', 'static unsigned int BN_STACK_pop(BN_STACK *st)\n{\n    return st->indexes[--(st->depth)];\n}']