test/drbgtest.c:140: error: NULL_DEREFERENCE
  pointer `t` last assigned on line 138 could be null and is dereferenced at line 140, column 5.
Showing all 10 steps of the trace


test/drbgtest.c:134:1: start of procedure kat_entropy()
132.   } TEST_CTX;
133.   
134. > static size_t kat_entropy(RAND_DRBG *drbg, unsigned char **pout,
135.                             int entropy, size_t min_len, size_t max_len,
136.                             int prediction_resistance)

test/drbgtest.c:138:5: 
136.                             int prediction_resistance)
137.   {
138. >     TEST_CTX *t = (TEST_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
139.   
140.       t->entropycnt++;

crypto/rand/drbg_lib.c:911:1: start of procedure RAND_DRBG_get_ex_data()
  909.   }
  910.   
  911. > void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx)
  912.   {
  913.       return CRYPTO_get_ex_data(&drbg->ex_data, idx);

crypto/rand/drbg_lib.c:913:5: 
  911.   void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx)
  912.   {
  913. >     return CRYPTO_get_ex_data(&drbg->ex_data, idx);
  914.   }
  915.   

crypto/ex_data.c:394:1: start of procedure CRYPTO_get_ex_data()
    392.    * particular index in the class used by this variable
    393.    */
    394. > void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx)
    395.   {
    396.       if (ad->sk == NULL || idx >= sk_void_num(ad->sk))

crypto/ex_data.c:396:9: Taking true branch
    394.   void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx)
    395.   {
    396.       if (ad->sk == NULL || idx >= sk_void_num(ad->sk))
                   ^
    397.           return NULL;
    398.       return sk_void_value(ad->sk, idx);

crypto/ex_data.c:397:9: 
    395.   {
    396.       if (ad->sk == NULL || idx >= sk_void_num(ad->sk))
    397. >         return NULL;
    398.       return sk_void_value(ad->sk, idx);
    399.   }

crypto/ex_data.c:399:1: return from a call to CRYPTO_get_ex_data
    397.           return NULL;
    398.       return sk_void_value(ad->sk, idx);
    399. > }

crypto/rand/drbg_lib.c:914:1: return from a call to RAND_DRBG_get_ex_data
  912.   {
  913.       return CRYPTO_get_ex_data(&drbg->ex_data, idx);
  914. > }
  915.   
  916.   

test/drbgtest.c:140:5: 
138.       TEST_CTX *t = (TEST_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
139.   
140. >     t->entropycnt++;
141.       *pout = (unsigned char *)t->entropy;
142.       return t->entropylen;
