crypto/ec/ecp_nist.c:160: error: NULL_DEREFERENCE
  pointer `ctx_new` last assigned on line 143 could be null and is dereferenced by call to `BN_CTX_free()` at line 160, column 5.
Showing all 26 steps of the trace


crypto/ec/ecp_nist.c:139:1: start of procedure ec_GFp_nist_field_sqr()
137.   }
138.   
139. > int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
140.                             BN_CTX *ctx)
141.   {

crypto/ec/ecp_nist.c:142:5: 
140.                             BN_CTX *ctx)
141.   {
142. >     int ret = 0;
143.       BN_CTX *ctx_new = NULL;
144.   

crypto/ec/ecp_nist.c:143:5: 
141.   {
142.       int ret = 0;
143. >     BN_CTX *ctx_new = NULL;
144.   
145.       if (!group || !r || !a) {

crypto/ec/ecp_nist.c:145:10: Taking false branch
143.       BN_CTX *ctx_new = NULL;
144.   
145.       if (!group || !r || !a) {
                ^
146.           ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
147.           goto err;

crypto/ec/ecp_nist.c:145:20: Taking false branch
143.       BN_CTX *ctx_new = NULL;
144.   
145.       if (!group || !r || !a) {
                          ^
146.           ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
147.           goto err;

crypto/ec/ecp_nist.c:145:26: Taking false branch
143.       BN_CTX *ctx_new = NULL;
144.   
145.       if (!group || !r || !a) {
                                ^
146.           ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
147.           goto err;

crypto/ec/ecp_nist.c:149:10: Taking false branch
147.           goto err;
148.       }
149.       if (!ctx)
                ^
150.           if ((ctx_new = ctx = BN_CTX_new()) == NULL)
151.               goto err;

crypto/ec/ecp_nist.c:153:10: Taking false branch
151.               goto err;
152.   
153.       if (!BN_sqr(r, a, ctx))
                ^
154.           goto err;
155.       if (!group->field_mod_func(r, r, group->field, ctx))

crypto/ec/ecp_nist.c:155:10: Taking true branch
153.       if (!BN_sqr(r, a, ctx))
154.           goto err;
155.       if (!group->field_mod_func(r, r, group->field, ctx))
                ^
156.           goto err;
157.   

crypto/ec/ecp_nist.c:159:2: 
157.   
158.       ret = 1;
159. >  err:
160.       BN_CTX_free(ctx_new);
161.       return ret;

crypto/ec/ecp_nist.c:160:5: 
158.       ret = 1;
159.    err:
160. >     BN_CTX_free(ctx_new);
161.       return ret;
162.   }

crypto/bn/bn_ctx.c:157:1: start of procedure BN_CTX_free()
  155.   }
  156.   
  157. > void BN_CTX_free(BN_CTX *ctx)
  158.   {
  159.   #ifdef BN_CTX_DEBUG

crypto/bn/bn_ctx.c:174:5: 
  172.       }
  173.   #endif
  174. >     BN_STACK_finish(&ctx->stack);
  175.       BN_POOL_finish(&ctx->pool);
  176.       OPENSSL_free(ctx);

crypto/bn/bn_ctx.c:243:1: start of procedure BN_STACK_finish()
    241.   }
    242.   
    243. > static void BN_STACK_finish(BN_STACK *st)
    244.   {
    245.       OPENSSL_free(st->indexes);

crypto/bn/bn_ctx.c:245:5: 
    243.   static void BN_STACK_finish(BN_STACK *st)
    244.   {
    245. >     OPENSSL_free(st->indexes);
    246.       st->indexes = NULL;
    247.   }

crypto/mem.c:295:1: start of procedure CRYPTO_free()
      293.   }
      294.   
      295. > void CRYPTO_free(void *str, const char *file, int line)
      296.   {
      297.       INCREMENT(free_count);

crypto/mem.c:298:9: Taking true branch
      296.   {
      297.       INCREMENT(free_count);
      298.       if (free_impl != NULL && free_impl != &CRYPTO_free) {
                     ^
      299.           free_impl(str, file, line);
      300.           return;

crypto/mem.c:298:30: Taking true branch
      296.   {
      297.       INCREMENT(free_count);
      298.       if (free_impl != NULL && free_impl != &CRYPTO_free) {
                                          ^
      299.           free_impl(str, file, line);
      300.           return;

crypto/mem.c:299:9: Skipping __function_pointer__(): unresolved function pointer
      297.       INCREMENT(free_count);
      298.       if (free_impl != NULL && free_impl != &CRYPTO_free) {
      299.           free_impl(str, file, line);
                     ^
      300.           return;
      301.       }

crypto/mem.c:300:9: 
      298.       if (free_impl != NULL && free_impl != &CRYPTO_free) {
      299.           free_impl(str, file, line);
      300. >         return;
      301.       }
      302.   

crypto/mem.c:314:1: return from a call to CRYPTO_free
      312.       free(str);
      313.   #endif
      314. > }
      315.   
      316.   void CRYPTO_clear_free(void *str, size_t num, const char *file, int line)

crypto/bn/bn_ctx.c:246:5: 
    244.   {
    245.       OPENSSL_free(st->indexes);
    246. >     st->indexes = NULL;
    247.   }
    248.   

crypto/bn/bn_ctx.c:247:1: return from a call to BN_STACK_finish
    245.       OPENSSL_free(st->indexes);
    246.       st->indexes = NULL;
    247. > }
    248.   
    249.   

crypto/bn/bn_ctx.c:175:5: 
  173.   #endif
  174.       BN_STACK_finish(&ctx->stack);
  175. >     BN_POOL_finish(&ctx->pool);
  176.       OPENSSL_free(ctx);
  177.   }

crypto/bn/bn_ctx.c:284:1: start of procedure BN_POOL_finish()
    282.   }
    283.   
    284. > static void BN_POOL_finish(BN_POOL *p)
    285.   {
    286.       unsigned int loop;

crypto/bn/bn_ctx.c:289:12: Loop condition is false. Leaving loop
    287.       BIGNUM *bn;
    288.   
    289.       while (p->head) {
                      ^
    290.           for (loop = 0, bn = p->head->vals; loop++ < BN_CTX_POOL_SIZE; bn++)
    291.               if (bn->d)

int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
                          BN_CTX *ctx)
{
    int ret = 0;
    BN_CTX *ctx_new = NULL;
    if (!group || !r || !a) {
        ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
        goto err;
    }
    if (!ctx)
        if ((ctx_new = ctx = BN_CTX_new()) == NULL)
            goto err;
    if (!BN_sqr(r, a, ctx))
        goto err;
    if (!group->field_mod_func(r, r, group->field, ctx))
        goto err;
    ret = 1;
 err:
    BN_CTX_free(ctx_new);
    return ret;
}
['int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,\n                          BN_CTX *ctx)\n{\n    int ret = 0;\n    BN_CTX *ctx_new = NULL;\n    if (!group || !r || !a) {\n        ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);\n        goto err;\n    }\n    if (!ctx)\n        if ((ctx_new = ctx = BN_CTX_new()) == NULL)\n            goto err;\n    if (!BN_sqr(r, a, ctx))\n        goto err;\n    if (!group->field_mod_func(r, r, group->field, ctx))\n        goto err;\n    ret = 1;\n err:\n    BN_CTX_free(ctx_new);\n    return ret;\n}', 'void BN_CTX_free(BN_CTX *ctx)\n{\n#ifdef BN_CTX_DEBUG\n    {\n        BN_POOL_ITEM *pool = ctx->pool.head;\n        fprintf(stderr, "BN_CTX_free, stack-size=%d, pool-bignums=%d\\n",\n                ctx->stack.size, ctx->pool.size);\n        fprintf(stderr, "dmaxs: ");\n        while (pool) {\n            unsigned loop = 0;\n            while (loop < BN_CTX_POOL_SIZE)\n                fprintf(stderr, "%02x ", pool->vals[loop++].dmax);\n            pool = pool->next;\n        }\n        fprintf(stderr, "\\n");\n    }\n#endif\n    BN_STACK_finish(&ctx->stack);\n    BN_POOL_finish(&ctx->pool);\n    OPENSSL_free(ctx);\n}', 'static void BN_STACK_finish(BN_STACK *st)\n{\n    OPENSSL_free(st->indexes);\n    st->indexes = NULL;\n}', 'void CRYPTO_free(void *str, const char *file, int line)\n{\n    INCREMENT(free_count);\n    if (free_impl != NULL && free_impl != &CRYPTO_free) {\n        free_impl(str, file, line);\n        return;\n    }\n#ifndef OPENSSL_NO_CRYPTO_MDEBUG\n    if (call_malloc_debug) {\n        CRYPTO_mem_debug_free(str, 0, file, line);\n        free(str);\n        CRYPTO_mem_debug_free(str, 1, file, line);\n    } else {\n        free(str);\n    }\n#else\n    free(str);\n#endif\n}', 'static void BN_POOL_finish(BN_POOL *p)\n{\n    unsigned int loop;\n    BIGNUM *bn;\n    while (p->head) {\n        for (loop = 0, bn = p->head->vals; loop++ < BN_CTX_POOL_SIZE; bn++)\n            if (bn->d)\n                BN_clear_free(bn);\n        p->current = p->head->next;\n        OPENSSL_free(p->head);\n        p->head = p->current;\n    }\n}']