test/drbgtest.c:509: error: NULL_DEREFERENCE
  pointer `ctx` last assigned on line 507 could be null and is dereferenced at line 509, column 9.
Showing all 13 steps of the trace


test/drbgtest.c:503:1: start of procedure get_entropy_hook()
501.   
502.   /* Intercepts and counts calls to the get_entropy() callback */
503. > static size_t get_entropy_hook(RAND_DRBG *drbg, unsigned char **pout,
504.                             int entropy, size_t min_len, size_t max_len)
505.   {

test/drbgtest.c:507:5: 
505.   {
506.       size_t ret;
507. >     HOOK_CTX *ctx = get_hook_ctx(drbg);
508.   
509.       if (ctx->fail != 0)

test/drbgtest.c:497:1: start of procedure get_hook_ctx()
  495.   static HOOK_CTX master_ctx, public_ctx, private_ctx;
  496.   
  497. > static HOOK_CTX *get_hook_ctx(RAND_DRBG *drbg)
  498.   {
  499.       return (HOOK_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);

test/drbgtest.c:499:5: 
  497.   static HOOK_CTX *get_hook_ctx(RAND_DRBG *drbg)
  498.   {
  499. >     return (HOOK_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
  500.   }
  501.   

crypto/rand/drbg_lib.c:617:1: start of procedure RAND_DRBG_get_ex_data()
    615.   }
    616.   
    617. > void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx)
    618.   {
    619.       return CRYPTO_get_ex_data(&drbg->ex_data, idx);

crypto/rand/drbg_lib.c:619:5: 
    617.   void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx)
    618.   {
    619. >     return CRYPTO_get_ex_data(&drbg->ex_data, idx);
    620.   }
    621.   

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

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

crypto/ex_data.c:396:9: 
      394.   {
      395.       if (ad->sk == NULL || idx >= sk_void_num(ad->sk))
      396. >         return NULL;
      397.       return sk_void_value(ad->sk, idx);
      398.   }

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

crypto/rand/drbg_lib.c:620:1: return from a call to RAND_DRBG_get_ex_data
    618.   {
    619.       return CRYPTO_get_ex_data(&drbg->ex_data, idx);
    620. > }
    621.   
    622.   

test/drbgtest.c:500:1: return from a call to get_hook_ctx
  498.   {
  499.       return (HOOK_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
  500. > }
  501.   
  502.   /* Intercepts and counts calls to the get_entropy() callback */

test/drbgtest.c:509:9: 
507.       HOOK_CTX *ctx = get_hook_ctx(drbg);
508.   
509. >     if (ctx->fail != 0)
510.           return 0;
511.   
