crypto/ec/ecp_nist.c:135: error: NULL_DEREFERENCE
  pointer `ctx_new` last assigned on line 118 could be null and is dereferenced by call to `BN_CTX_free()` at line 135, column 5.
Showing all 27 steps of the trace


crypto/ec/ecp_nist.c:114:1: start of procedure ec_GFp_nist_field_mul()
112.   }
113.   
114. > int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
115.                             const BIGNUM *b, BN_CTX *ctx)
116.   {

crypto/ec/ecp_nist.c:117:5: 
115.                             const BIGNUM *b, BN_CTX *ctx)
116.   {
117. >     int ret = 0;
118.       BN_CTX *ctx_new = NULL;
119.   

crypto/ec/ecp_nist.c:118:5: 
116.   {
117.       int ret = 0;
118. >     BN_CTX *ctx_new = NULL;
119.   
120.       if (!group || !r || !a || !b) {

crypto/ec/ecp_nist.c:120:10: Taking false branch
118.       BN_CTX *ctx_new = NULL;
119.   
120.       if (!group || !r || !a || !b) {
                ^
121.           ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
122.           goto err;

crypto/ec/ecp_nist.c:120:20: Taking false branch
118.       BN_CTX *ctx_new = NULL;
119.   
120.       if (!group || !r || !a || !b) {
                          ^
121.           ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
122.           goto err;

crypto/ec/ecp_nist.c:120:26: Taking false branch
118.       BN_CTX *ctx_new = NULL;
119.   
120.       if (!group || !r || !a || !b) {
                                ^
121.           ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
122.           goto err;

crypto/ec/ecp_nist.c:120:32: Taking false branch
118.       BN_CTX *ctx_new = NULL;
119.   
120.       if (!group || !r || !a || !b) {
                                      ^
121.           ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
122.           goto err;

crypto/ec/ecp_nist.c:124:10: Taking false branch
122.           goto err;
123.       }
124.       if (!ctx)
                ^
125.           if ((ctx_new = ctx = BN_CTX_new()) == NULL)
126.               goto err;

crypto/ec/ecp_nist.c:128:10: Taking false branch
126.               goto err;
127.   
128.       if (!BN_mul(r, a, b, ctx))
                ^
129.           goto err;
130.       if (!group->field_mod_func(r, r, group->field, ctx))

crypto/ec/ecp_nist.c:130:10: Taking true branch
128.       if (!BN_mul(r, a, b, ctx))
129.           goto err;
130.       if (!group->field_mod_func(r, r, group->field, ctx))
                ^
131.           goto err;
132.   

crypto/ec/ecp_nist.c:134:2: 
132.   
133.       ret = 1;
134. >  err:
135.       BN_CTX_free(ctx_new);
136.       return ret;

crypto/ec/ecp_nist.c:135:5: 
133.       ret = 1;
134.    err:
135. >     BN_CTX_free(ctx_new);
136.       return ret;
137.   }

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)
