crypto/bn/bn_mod.c:218: error: INTEGER_OVERFLOW_L2
  ([0, +oo] - 1):unsigned32 by call to `BN_CTX_end`.
Showing all 9 steps of the trace


crypto/bn/bn_mod.c:193:1: Parameter `ctx->pool.used`
191.   
192.   /* slow but works */
193. > int BN_mod_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m,
194.                  BN_CTX *ctx)
195.   {

crypto/bn/bn_mod.c:204:14: Call
202.   
203.       BN_CTX_start(ctx);
204.       if ((t = BN_CTX_get(ctx)) == NULL)
                    ^
205.           goto err;
206.       if (a == b) {

crypto/bn/bn_ctx.c:212:1: Parameter `ctx->pool.used`
  210.   }
  211.   
  212. > BIGNUM *BN_CTX_get(BN_CTX *ctx)
  213.   {
  214.       BIGNUM *ret;

crypto/bn/bn_mod.c:218:5: Call
216.       ret = 1;
217.    err:
218.       BN_CTX_end(ctx);
           ^
219.       return ret;
220.   }

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

crypto/bn/bn_ctx.c:204:13: Call
  202.           /* Does this stack frame have anything to release? */
  203.           if (fp < ctx->used)
  204.               BN_POOL_release(&ctx->pool, ctx->used - fp);
                     ^
  205.           ctx->used = fp;
  206.           /* Unjam "too_many" in case "get" had failed */

crypto/bn/bn_ctx.c:346:1: <LHS trace>
344.   }
345.   
346. > static void BN_POOL_release(BN_POOL *p, unsigned int num)
347.   {
348.       unsigned int offset = (p->used - 1) % BN_CTX_POOL_SIZE;

crypto/bn/bn_ctx.c:346:1: Parameter `p->used`
    344.   }
    345.   
    346. > static void BN_POOL_release(BN_POOL *p, unsigned int num)
    347.   {
    348.       unsigned int offset = (p->used - 1) % BN_CTX_POOL_SIZE;

crypto/bn/bn_ctx.c:348:5: Binary operation: ([0, +oo] - 1):unsigned32 by call to `BN_CTX_end` 
    346.   static void BN_POOL_release(BN_POOL *p, unsigned int num)
    347.   {
    348.       unsigned int offset = (p->used - 1) % BN_CTX_POOL_SIZE;
               ^
    349.   
    350.       p->used -= num;

static void BN_POOL_release(BN_POOL *p, unsigned int num)
{
    unsigned int offset = (p->used - 1) % BN_CTX_POOL_SIZE;
    p->used -= num;
    while (num--) {
        bn_check_top(p->current->vals + offset);
        if (offset == 0) {
            offset = BN_CTX_POOL_SIZE - 1;
            p->current = p->current->prev;
        } else
            offset--;
    }
}
['int BN_mod_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m,\n               BN_CTX *ctx)\n{\n    BIGNUM *t;\n    int ret = 0;\n    bn_check_top(a);\n    bn_check_top(b);\n    bn_check_top(m);\n    BN_CTX_start(ctx);\n    if ((t = BN_CTX_get(ctx)) == NULL)\n        goto err;\n    if (a == b) {\n        if (!BN_sqr(t, a, ctx))\n            goto err;\n    } else {\n        if (!BN_mul(t, a, b, ctx))\n            goto err;\n    }\n    if (!BN_nnmod(r, t, m, ctx))\n        goto err;\n    bn_check_top(r);\n    ret = 1;\n err:\n    BN_CTX_end(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}', '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 void BN_POOL_release(BN_POOL *p, unsigned int num)\n{\n    unsigned int offset = (p->used - 1) % BN_CTX_POOL_SIZE;\n    p->used -= num;\n    while (num--) {\n        bn_check_top(p->current->vals + offset);\n        if (offset == 0) {\n            offset = BN_CTX_POOL_SIZE - 1;\n            p->current = p->current->prev;\n        } else\n            offset--;\n    }\n}']